Malicious PDF — malware analysis report

Static analysis result for SHA-256 4daaa4a483e6680e…

MALICIOUS

PDF

88.0 KB Created: 2021-07-12 16:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 210736b540fbb6ad18439d86f398c99d SHA-1: b85f0153fba158efc08d457bfd30ee5010a6f83a SHA-256: 4daaa4a483e6680eb16a56ec09eecc3f123d557746640066dc7711714aff85e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. While no scripts were directly extracted, the nature of the URLs and the PDF format itself often leverage embedded JavaScript for malicious redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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 http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f50186b84---20428657405.pdf
    • http://historia-bfured.hu/userfiles/file/gilitot.pdf
    • http://hibertek.com/image/files/20210612_091819.pdf
    • https://usssecuritate.ro/userfiles/file/21530701470.pdf
    • http://herium.net/FileData/ckfinder/files/20210705_E45ED04EBDDEC9F2.pdf
    • http://architects-desk.com/uploadsfile/41722920071.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607549adab22b---tikatew.pdf
    • http://princeverma.in/uploads/files/rugudisetubi.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b88e47713---7962846090.pdf
    • http://lindseyderence.com/userfiles/files/47669679222.pdf
    • http://bscartridge.com/pic/gifisijomilexasuvev.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071d29eb949d---4456633389.pdf
    • http://studioprogettoarchitettura.eu/userfiles/files/7097831136.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160980d634836c---rafizajuzur.pdf
    • http://asfus.net/virgsurv/userfiles/file/41408958072.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade63920381---35080275375.pdf
    • https://nhatngudongkinh.com/upload/ckupload/files/zazadaresiwararilavakujis.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606efcded3196---dadajipavonovebax.pdf
    • https://dbjadow.pl/attachments/file/33497426046.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f303dbde4---bisuwusafiwagev.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608464ce862fc---77001007771.pdf
    • http://1night2day.com/ckupload/files/50706116091.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8066a76ee---27142974912.pdf
    • http://portalcom-b2b.es/img/user///file/_0920833001620039695.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/lks5h9jg2pqnfp204l6gft3u5v/leporepened.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609032b6c4b04---niniponaxijapevamixu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=trails+to+azure+english
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb8a.bin
a9b12c763e31b3c153e3a5212ecb97b03a3b1c414382dd13fc1f96cf3de17504
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8A 2308 bytes
font_01_sfnt_off0000f5d0.bin
26fa49831b90642e6113ceaa73a04e1713f36aed1b9ff80c2c23f473bcfb75e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 16980 bytes
font_02_sfnt_off000121ff.bin
2ceb1fcd966d55b25a3930a3e9afdafa171fbc29869de7b5dbec70a2788e04e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x121FF 10512 bytes
font_03_sfnt_off000139e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x139E7 16792 bytes