Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ec72c55d09b4616…

MALICIOUS

PDF

85.2 KB Created: 2021-09-14 11:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35eca3961f6c3229f98da115a06d5e1a SHA-1: 119a74c63783765c9800a98f87bb2799827b351a SHA-256: 1ec72c55d09b4616db47ef2607839d56b015f9a4c6afe561edd578ce74590c28
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam pretext, aiming to trick users into interacting with the provided links or potentially calling a number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=pokemon+rom+hack+all+regions PDF link annotation
    • http://box8websites.com/ckfinder/userfiles/files/63286294754.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/banatisumufagozekobafufo.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/segutaxijuli.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357dbb0f29d---gifezigewafipinup.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/lodepupibogexetow.pdfIn PDF document text
    • http://unseretochter.ch/images/file/81635901265.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c94af539da---bivegoxu.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/101316568056.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/33194027026.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/53881163009.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/zuxerorujivedevekak.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347346ed2dc---66012985108.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/dopewepujixekebamiv.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/wenufopenedowabamixuzo.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/60716641530.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/74444051065.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613269b42d6a0---vimifosigerefigi.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210903210712.pdfIn PDF document text
    • http://atek-ent.com/upload/file/vowemov.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/nidol.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/pivumuk.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8f2abaa74---mejinemewexomoti.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/6ea95921a04e04e01136f8bc006380ea/guwuwatavufimorukameput.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/54268136292.pdfIn PDF document text
    • 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_off0000e73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73F 18264 bytes
SHA-256: e701c7b5a80a14abb46deeea37c537726649e2fc43abe475593690b248dbc6c9
font_01_sfnt_off00011698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAF 10672 bytes
SHA-256: e30c244acd632c2440e60c53a1336a4e7ad1345f904b516034661c9e7ddf6cf7

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