Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13af2831f2266ac…

MALICIOUS

PDF

84.6 KB Created: 2021-07-10 13:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4017582dc5f3c6edfe9097ffb965e9ab SHA-1: 4360460efe9546c34980ecafe182835516badc2a SHA-256: b13af2831f2266ac44060fe9155b3f0cb1fff3fef790e7db01b5644552694242
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The embedded URLs suggest an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/brdo2f1lo01dtbtm3h4nl3sqa7/14681904121.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/36f522ee0a306757f1654aafe5dc7feb/tarozivumakinifimijim.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/b496df99a48af20c0186681ce81e6d3b/33133598419.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/l4tdbfdlr4hqcn2pn59jfb07b3/52703485506.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a09ad6752---jixuguxinerisetep.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85d9374a76---16043000109.pdf
    • https://amgaa.org/temp//files/nisafimosigenavifita.pdf
    • https://sahodayabbsr.com/test/fckeditor/file/miwobazatitinumurizupo.pdf
    • http://eska-lift.ru/userfiles/file/49801066090.pdf
    • https://efnnma.org/files/file/kanilirogonumib.pdf
    • http://ndt-tl.ru/upload/file/kuxasiz.pdf
    • http://nemdanangpho.com/uploads/2021-06-02/images/files/99771092048.pdf
    • https://theatresaucinema.fr/uploads/file/79300944477.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/ae4a2c4e11827099ff7e897b7f6ac27e/mefapegoj.pdf
    • https://aimhc.com/userfiles/file/10879299304.pdf
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/2174139506.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607263c8deff2---dawinebefezoneko.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/c9ab06f94c2a76ded573bace988f92f3/48673787407.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/8hmiet1blkahao2tup24ao8v24/pabebubabixefogalefodewog.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16079dd6253003---furitomoxukujuvaluwa.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160722738c5635---46736960874.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db700d493a---58245998359.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+descent+of+man+handmaid%27s+tale
    • 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_off0000eaab.bin
277fdc438703a0dfb9a218748821a3edd05bc8996a289e59230c05b479076050
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAB 16248 bytes
font_01_sfnt_off000114e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114E9 16792 bytes
font_02_sfnt_off00012d00.bin
22027d0c1a26f7c72c425bfccbeab1b3967c6a58d061bc6b2778d7441f2746ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D00 10636 bytes