Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec843ce794e474d…

MALICIOUS

PDF

87.7 KB Created: 2021-06-27 03:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf6a194cf6e76bbd57ad73e59583578c SHA-1: 700f0cc34366aaf2fc96143d805da8180f70ad71 SHA-256: aec843ce794e474d51bfa4def9d300462aa9737da38acb2876f62e905409a2ea
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The presence of these links suggests an attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://abnicum.com/files/file/nedugaweruwexowivewe.pdf
    • http://50wj66.com/clients/a/af/af9d65f11c1965a5434adcd4cd578f00/File/vejojorotijuxepes.pdf
    • http://nw-line.ru/generic/uploaded/62977869775.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe42be6b3b---81229918543.pdf
    • https://aawyx.com/sites/default/imageuser/file/87946714172.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/k73qdghdv5o8mbb8ntj1si5o15/wikuxodalugabewewulovowex.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/o40eb2batnr1c0vjhte9oackn1/700197254.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee6a81c575---pixibisotevi.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/5edbeeea4c654c2418c17191e58f4b78/sevimewewefemokabasixer.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/416bb86354cc5c156c41d962c39e5c3e/sibojidijumiwutegiz.pdf
    • http://karate-talence.com/newsite/userfiles/files/73014607998.pdf
    • http://varanini.pl/userfiles/file/66653537101.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/9ab8b8acbcd41400e2f116b468099e5e/27511748731.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/989543453.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/b0c58febd008c3cc7781ceaec2415cd4/78261643378.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffef821a12---fazaniwixefotutiwa.pdf
    • http://ebslang.net/_UploadFile/Images/file/tumiwixoloxovibisi.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/ropukadi.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/1b15ebb40de25b5c646e10ea8e49f3c0/59670679892.pdf
    • https://www.profiemg.cz/upload/ck/files/surubuvapamup.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/47ac2af6019f20029ac3ee105c0f3a22/pimupidefepepikeko.pdf
    • http://astro2sphere.com/admin/images/file/gozikopiv.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/guxomasivefuraroj.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/42c5be6f88a21722ef51d1f04c73c534/87925897955.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a826a0afc---bepamororopisobudeb.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+save+a+pdf+with+text+fields
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f243.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF243 16792 bytes
font_01_sfnt_off00010a55.bin
bc06011776ff98eb1e4e51adaaa217d63ceef8c5d8fde2648838118e15229ab1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A55 17656 bytes
font_02_sfnt_off000138f1.bin
afecf1af830ec31dc004a11c40c5df3cb195490b6d4dd52d9198d88d19c7fccc
pdf-font-stream PDF embedded font (sfnt) at offset 0x138F1 10636 bytes