Malicious PDF — malware analysis report

Static analysis result for SHA-256 adba28a234608a36…

MALICIOUS

PDF

87.8 KB Created: 2021-07-02 14:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7ff8406e7086280e50cac20db99f69a4 SHA-1: e7af84cc2cb6bf4ea3e31d29f3ef999b6fcdc01b SHA-256: adba28a234608a3652fd447f1ad7cd614c8eb88e729c3926a59a27ac4d040783
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised websites, some hosted on disposable domains. The presence of a 'download button' lure and callback phishing indicators further suggest a deceptive workflow aimed at tricking the user into downloading further malware or engaging in a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://szpital-sulecin.pl/images/fckfiles/file/31901360223.pdf In PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/mok0a6fir0tponf5plo294354j/zomagituwimogenavomarut.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/0on5cg9obplgbhdjkh25ole3n6/raxowefimodigularafifa.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/8586219741f444075656bc07a6b9ae03/dezaba.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/jowumujidiloviri.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/1de802661fb66d164e8825387339c8d2/kopukoxopopibimik.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/0c75056a7116ac335c7cad471b2c7320/pisujalokele.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/a23330e460af891d56885b3c52fa0627/xajuxututupobuk.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/61178508299.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/7bb8114a9be151047e697671e1307255/veferas.pdfIn PDF document text
    • http://hnspkjx.com/d/files/rafukeboganezazu.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/60537189286.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5db971215---25526229126.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/purusomepezu.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777a0b6157d---96835776090.pdfIn PDF document text
    • https://red-adlay.com/upload/files/70183000529.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/wolapi.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/64240775233.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/2d454bbed93187ee364b6fd45bc09d49/lupaji.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d75076e68---32785048637.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/36489582795.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160da5243c0588---gosutexeduxisimodavepi.pdfIn PDF document text
    • https://ancoraeducacion.com/images/17353162909.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/76le8klh8nmvtbplesqon5okif/nasizodipexalewovurazed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=cute+wallpapers+for+laptopPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 10372 bytes
SHA-256: c5471703f891724d7e139e2bf839f7bbabd6d2cb88899400b9dc933c3a05a6fd
font_01_sfnt_off00010d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12566 17064 bytes
SHA-256: 983148cf34f90b0f77c09e93dbfd7e25a91b635d5ef7aeaacc41e5665194ac97

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