Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c3778b61d172f1…

MALICIOUS

PDF

85.0 KB Created: 2021-09-19 04:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d03b2354b609583b501e0350b2066a09 SHA-1: f12f4a6533d489c57448a45200ab6360b535c40a SHA-256: a3c3778b61d172f122a82f1f079c5d072f7a8a7bd968d2a4c004af4bf1d1c208
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to 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://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/zurufalom.pdf
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/34882283038.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/be10d07ad0a93bd4cc505dd2bc1ceb9f/biwezewilenega.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/rvr3clqovc12vikqjssflmpklg/sobusuvezegozosebezuvus.pdf
    • https://mycocoa.org/images/upload/files/ronavatum.pdf
    • http://kartinatv.org/uploads/files/kudodorozewoxo.pdf
    • http://ramenhajimetustin.com/uploads/files/regabaxisixidatikibaligap.pdf
    • https://angkaganjil.com/contents/files/xerokexabufifesa.pdf
    • http://ecohouse-lab.com/userfiles/file/3045557175.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/hhbjjfha83hd962qogpmvav4b4/11545782774.pdf
    • https://sitarasign.ir/data/file/3429403079.pdf
    • http://surausa.com/uploads/files/66276129650.pdf
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/xepozokifasojuwuzi.pdf
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/jalujud.pdf
    • https://quizai.com/uploads/files/zalidimimegif.pdf
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/32095078951.pdf
    • http://mybed.tw/uploads/files/202109131626447335.pdf
    • http://albino-pitti.com/pub_img/file/29514359853.pdf
    • https://bmw-zona.ru/uploads/file/vumudotopewareta.pdf
    • https://santaclara.com/wysiwygfiles/file/medafekedojajalo.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/f3ea40440b6069ef8e2da838585b41ec/18105857574.pdf
    • https://jnnjhansi.com/userfiles/file/ruzuvekebiminu.pdf
    • http://casaperugia.fr/userfiles/file/50560503480.pdf
    • http://zatoodesign.com/userfiles/files/dubimupizimaguzuze.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+save+as+pdf+instead+of+print
    • 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_off0000e7c5.bin
8c9e7ca6d168fb175c302be9710d01fd3a7d516dddfc19a72a2a005105e917ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C5 17608 bytes
font_01_sfnt_off00011591.bin
54d8ae371a9c86e417ea243e44e84855c80cb837fe200513c9c35f79c9e25530
pdf-font-stream PDF embedded font (sfnt) at offset 0x11591 10588 bytes
font_02_sfnt_off00012de3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE3 16792 bytes