Malicious PDF — malware analysis report

Static analysis result for SHA-256 b558e2b11363aad4…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 05:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e13ef982ab5677a4e7f95f39b0abc7f0 SHA-1: 1ae87d5c8041be0193df88763ed060069eb94656 SHA-256: b558e2b11363aad49f0809dbc95381742279ee23d498e48aae5cb3514e40b0da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content or phishing sites. While no scripts were explicitly extracted, the nature of the link farm and the 'compromised CMS upload link farm' heuristic indicate a likely intent to leverage these compromised sites for further distribution or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/b36e0422d5487baf30fc7fab5eb14752/sogaseliritetulipaz.pdf In PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609592a29bcb6---70809623330.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/pilepobeno.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/80128833730.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/402edc4e374327b8dc72fb476a98e469/71761821653.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/tiwaxototanu.pdfIn PDF document text
    • http://aimic.com/userfiles/file/mewomanonulapexilurav.pdfIn PDF document text
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/99514679133.pdfIn PDF document text
    • http://jump360.co/upload/files/20210616094242.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/33242817361.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160703ee5013b1---lipokonomis.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/70791960414.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/41898217163.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/419d74c7c80962962870ec64918c2ef6/12830408912.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/69938851911.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/1116991727.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/19c5edb2304f987cf8eae6074c09bca2/jezilaxowemorelebadeserer.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3f76b942c---86920314825.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a245c79b4dd---dobikamujilok.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/xamagobipepotinobure.pdfIn PDF document text
    • https://anduong-nhatthanh.com/uploads/news_file/23407827313.pdfIn PDF document text
    • http://jejuecotech.com/ckupload/files/sagalewovej.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/7e1ba6ca6a696d647f4dbf143b8c9784/kaguwe.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/32545946072.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/56551e11b2638c2b3ada8ededf35f748/41700713881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=dear+god+please+protect+my+family+and+friendsPDF 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_off0000e03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03A 11076 bytes
SHA-256: fa8740384d3bb2c4bc90bac9721b43e299db527f159f308aadf42852fedec8ca
font_01_sfnt_off0000f9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EE 18216 bytes
SHA-256: c4b20fac83dd7c94ea06ccd540e3675b5911543182ee9d51e058b5ad661d302a