Malicious PDF — malware analysis report

Static analysis result for SHA-256 8caf0157923715f7…

MALICIOUS

PDF

92.7 KB Created: 2021-08-15 18:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f4c18203836b58cd226367266323cde SHA-1: 065f589041a7d48957fa95f6b5ac9785accd8710 SHA-256: 8caf0157923715f7e0f400f5ebbb32088ac44d720aeda7ffa1eb0a6bc5df9897
156 Risk Score

Malware Insights

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

The PDF file was identified 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 compromised or disposable hosting sites, likely for phishing or malware distribution. The embedded URLs, such as http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88e44e9f31---64263524210.pdf, are key indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c777f21dbeb---wedixakezupolev.pdf In PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4afa8ce443c16e18dd6156937eed3ac9/vorugow.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/3418820378.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608283b777b14---gujolotez.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88e44e9f31---64263524210.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/rtgc4vd0ks10r9akqps7te8cgt/xekadafo.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/82817582874.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/renetivi.pdfIn PDF document text
    • https://lepjunk12.hu/uploads/files/lilozupidusakuxiwo.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/gebewadasukasofor.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/9lt1rh93elhav7tqi2jqfvc12v/beloweponovuposinopom.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105191935.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbca1b29cc---84021340012.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/zovojodi.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/noppknhtipb1pp004r3pde8ai5/pababugaposedob.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/vunisamusunolazokunetap.pdfIn PDF document text
    • http://alkanboya.com/files/file///sobugukodukefojeb.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8da6bbbe4c---nevavezefoduwen.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbc8c14635---fidotagujeg.pdfIn PDF document text
    • https://vietspices.asia/uploads/files/dubelepewezazudivosal.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/ruguriwatufutipagatogus.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210611193633186987934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=phool+bane+angaray+full+hd+movie+free+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C3 11044 bytes
SHA-256: d3cc9d20b709932c9d2ca8292e793a471ffed8247596aa5e5d3449bf7d8a9ad7
font_02_sfnt_off0001120a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120A 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
font_03_sfnt_off00011a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A39 16384 bytes
SHA-256: 8f005da5425caaf2fd6b6fe4c0f1a47e8ad0efb95bfcfe8d621cfb587399b12f
font_04_sfnt_off000130a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A7 18832 bytes
SHA-256: 62cca66436ac196162045759adda3db255a99433a407c291dbf790c05536e899

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