Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f5e2ba1f642a594…

MALICIOUS

PDF

86.6 KB Created: 2021-09-19 06:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b9aef5aeb112bcbfa9ca0fc0ecf9b6f SHA-1: cd1432ebcd7baad19abb5c8e740d290bdda21ccd SHA-256: 2f5e2ba1f642a5949f869d7502b772f3a252b6283afcba39f522d79fffa4b1b7
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, pointing to multiple distinct hosts, many of which appear to be compromised WordPress upload directories. The embedded URLs suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8d1402064---32415348252.pdf In PDF document text
    • http://pure-chiral.com/upload/files/sepufivofaxenevawepe.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131bdb2e3555---93329395177.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/vezebizuridixadix.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/62166100851.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/lowekevotifefemoligufopo.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/pazikezizogederetunava.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/bugupugigur.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/5c45105a5f4fa1b7ed436bbbc471b0e5/viwakisubiterimumotew.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/74472673202.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/wusivuzatewu.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/monigasevet.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/26834967447.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/tinaturukamapalaragukus.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/23451297425.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/dejitubije.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/tokeretipotapebavanopovu.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/16871638105.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/mupetonadelixaxa.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/wumupebagapotuweg.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/fuwunosuje.pdfIn PDF document text
    • http://lizhechem.com/upload/files/zenewuw.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142285dd90a5---bemagizodobivi.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/lelajoxumekabetes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+restore+battery+health+androidPDF 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_off0000eaa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA8 18980 bytes
SHA-256: 0a5bd2407f7fef783be50cb44f091df874378344dad07118101f7712018da07c
font_01_sfnt_off00011c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001341f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341F 10676 bytes
SHA-256: 46f61223cbcf7adb2212e93bcf7ebbd5d5f3bd7c8a6a5b58814eae32e43f67e5

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