Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5851ff95595b8dc…

MALICIOUS

PDF

85.3 KB Created: 2021-09-02 18:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7bb7966bc082adc4a28d1e2ed76e9b2d SHA-1: ca4275bd50503660975d10055959c9cf7953be29 SHA-256: d5851ff95595b8dc4d949f789f39a1e390ac38fa6f9d1320aa4d16838a77ef76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of these links strongly implies an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=descriptive+and+limiting+adjectives+worksheet+grade+4 PDF link annotation
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad04719b33a---fobagexagi.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/35obg473qij01k44vhjv02d114/fowakelufureji.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833761009d6---lapexejivimorirolanubet.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/nodogur.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/vavelanolagovenikolemuzor.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210902_5A5613DCE2260F29.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/37292706696.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608363a40f9c6---96345205817.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/vulelejiriwuteradapebope.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/2580349309.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2e0943ef5532fc0ca9c026ceb04a25e2/87513129932.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/27758876198.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/14478359778.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/92556138901.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/gabalunopubeluva.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b92993062---wologirifopusu.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098838146647---gabugaverunizu.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/65704136396.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/20869463133.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/dafodorosupibukavatatafom.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/muxis.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/43ec82199e43893ef9547a2fd8d64b59/novozuzetotafazupimaj.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/57d07fca2d5a84ba4c9134bc5709779f/mepavuvuvapuf.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EE 11412 bytes
SHA-256: 76de1cd0ad1f9520e40ece054053615c945b8bb2dd6c077d6f7c114e7374db94
font_01_sfnt_off00010187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10187 17964 bytes
SHA-256: e58671e78c8c02aebbb7fd16b472565c41dcbcca0f4ea720aa6433752e9ac491
font_02_sfnt_off00012edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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