Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df07bdf9efa7cae…

MALICIOUS

PDF

87.8 KB Created: 2021-09-01 02:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 9b07c4856cc11f4dda9519937f4a4379 SHA-1: 93f1b37760e047b04b70d014734c4237b316749c SHA-256: 2df07bdf9efa7caea9f7282ee8df2ccb299f27c3e1101ce2dde4199e8f69a8e7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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) 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 https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/518eddb281516d0e94c5ab265beca88f/sibatobujisuxofugomabuz.pdf In PDF document text
    • http://qlionshousing.ca/userfiles/file/kutabitinenodevaliga.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/45985445638.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/vugevoj.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/44418540012.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210713_045929.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160760dbb61053---69421091157.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c9d9e5e790dfb48d5c8523460264ac1f/61779003102.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607850f5a3cdf---16384732731.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/dovilunizagibifevaga.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/195qtitfg4462esltmk8hk9jks/33639293255.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16084596821bb8---11490989197.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/53799063710.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/66p0lemtk9egd6qcajvuguipto/wepumuvodir.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/279ee6f82b1866b43b23434297cdc7db/tutazisaporeropa.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66ee0219e0---44936283051.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/60510598695.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/pufaguze.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/cc139746561bb4b3e1160d2c7907ddd5/kubovibipetakixuwupeji.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/gukavizojosutakejamanewa.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2ff0da6b7---kifarifudaginezukogofi.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/55963189937.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad16b403a9f---99023662254.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/83936909854.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/womedebuvusuzogase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=taylor+swift+shake+it+off+instrumental+mp3+downloadPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10397 19372 bytes
SHA-256: 3c419eee5a33848817d8cc77078bd82fe4fe9404baeaa7dfa2e6b19b2b5cd177
font_02_sfnt_off000135d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D3 11292 bytes
SHA-256: ddcd9e69b233e38491e0e30cd41ed09037dcfb2dec5dbd98fac3b0c1e6b7fc96

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