Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac48a6cc0d271e0…

MALICIOUS

PDF

85.2 KB Created: 2021-09-16 05:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 587f75558c8b95776aeb938343ab5b96 SHA-1: ab4b855d651bd80c3b5c9743be38e2e86b7f565e SHA-256: 4ac48a6cc0d271e00a8765e68052e5cdeabedec9c1c379a7483e037ef88dbb02
156 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. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM firings further supports this, indicating a strategy to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://recviem.ru/img/upload/51361193043.pdf In PDF document text
    • http://abwmechanicsville.com/uploads/files/36217968429.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/67131425605.pdfIn PDF document text
    • http://qwerty.pl/_data/file/pusesowomoxowamunav.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0c2915d010fc9a8e9d7eed2c662de2af/39123401294.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210908135916.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/navujiguwexukapegejur.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/64afab1bc50e1d232a734e32c65a57ab/pobefumoda.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/mufipugifit.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109150913166366.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/tokofelupidodonakodisotob.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/84524580629.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/memaxovimobajirelinuvedat.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/60660373157.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/58009008128.pdfIn PDF document text
    • https://diphong.com/uploads/nonujoramojufowajileseno.pdfIn PDF document text
    • http://minhanh.com/files/99361692711.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6bdd270ec---92351363553.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/357237618.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece90c208d---loxufogitivi.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210903_051116.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/5333921291.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/kokubiburuvuzoxixisapu.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/95194688107.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/b0a6faf202b3269e4eae3116b2ec0d85/43474419566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=3d+dj+mixer+2021+apk+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_off0000e663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE663 17940 bytes
SHA-256: 8bcf3804a8376267e272cccddccef20c6cd7555271e943b56a4359a96a71068c
font_01_sfnt_off00011505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11505 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1C 11068 bytes
SHA-256: 0523048490b8bdb896b4d7b1b5ee2c7e9baca195377bc11281c22fdf3b621fa5

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