Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f119a17576e20c5…

MALICIOUS

PDF

89.4 KB Created: 2021-09-06 11:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dc73bd71c90147a9b525ac8a99395deb SHA-1: 87660d21c25628fc049e1775001705dcea9b21cc SHA-256: 7f119a17576e20c5db0b7526c1fd1d910c2807008c35db5028999d6384676adb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://ingpoggi.eu/userfiles/files/18264023130.pdf In PDF document text
    • https://anjingliar2.com/contents//files/sutabawexobif.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/17448684461.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cc97b861955---5429186385.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3a15aef50---pasifumofezipipijeratu.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/86698690709.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/vepegiguzosoboponuwepanag.pdfIn PDF document text
    • http://qwerty.pl/_data/file/tadakubukagonisur.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/49277588775.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/jezepazimopi.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160fbbf4a23b27---93856823244.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/26572276905.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f65574f14c---36282450985.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/55734437070.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba112283dd---kasajiv.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/pefubuluve.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/3bc8f06066d347a1d43bf5c7d5510105/kazitalumefinazex.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/wugiropix.pdfIn PDF document text
    • https://soechi.net/userfiles/file/zusudegikozeda.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/delemiduxirabajowovuzugok.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/6cf2288f0411bdb1b1cfbcbd70baec11/54474849367.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/70908231005.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021052513591973499.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/q5ra46s95grqbf5o40q0gvv8d0/92169440781.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/xikawikis.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/89024088478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=cambios+biologicos+psicologicos+y+sociales+en+la+adolescencia+pdfPDF 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_off0000f4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 11052 bytes
SHA-256: bfa12bf74eec7268fb2c4c48c43ab049078572e55f0313ca34b5ade14a2f4e91
font_01_sfnt_off00010df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF0 19924 bytes
SHA-256: 5e7c9c7f51fa2496ab27ee14eb7a4338c7d950f945f6f0241ee4fc54555da14f
font_02_sfnt_off00013f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1