Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c288e76ba9b071…

MALICIOUS

PDF

80.9 KB Created: 2021-08-24 06:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bbd1e2ada7219a4c0ed3407247e03ea9 SHA-1: b6963051f00c2c2c8fb78084a38733eb4f0567ad SHA-256: 73c288e76ba9b0716251f5b6f7e177c464c82d14425a5e21c6a181599a0a996b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a link farm, designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://augustaelectricalwork.com/editorData/file/65096475481.pdf In PDF document text
    • http://wwpokebar.com/uploads/files/34516570302.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/togetebezin.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/69846249558.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd0fb613a4---piwolisobize.pdfIn PDF document text
    • http://daydala.com/userfiles/file/tixamoju.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/6f2b063af9f8e4bac7dda6c61afee359/20362613147.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/bisaxapidakovunev.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab634a550a---wejazefuteb.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16116d991655fb---71534101519.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/h6a441p0kq4h6jnp20turnvnl5/63649048422.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/77127746687.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210823_9C22CF3109942C91.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/e64a1bfeabf2e095716a760cd32a0070/37941077949.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/17086780773.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/78v83k11s2rd4pk7c42th0s8i0/55360556856.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/12088359199.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/nutabamirarijafasu.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/vjouubj0tpbln6mirejv4tnl51/rubogu.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611e45915525f---begup.pdfIn PDF document text
    • http://prestopc.it/upload/file/98164856312.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/15124174580.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/zazixezivajanaf.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/tetuvevabukelo.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/04d6b3a41cdf4e860a3dbdfe2e2c896e/gegajofupopudafexaxikiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=makkar+cue+card+may+to+august+2020+pdf+downloadPDF 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_off0000d8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 11496 bytes
SHA-256: c956a7b5a074008ee4d0d37a955db54d9229318e147e9028599ac8f569ede539
font_02_sfnt_off00010c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C39 15284 bytes
SHA-256: 09c1566a003f1dba5db626bcb7718491a4db0d325e82285606742990bfe4e13d