Malicious PDF — malware analysis report

Static analysis result for SHA-256 c034a65a1d75429c…

MALICIOUS

PDF

91.1 KB Created: 2021-08-11 18:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7af62bed429ec5015c19b2f43d093683 SHA-1: 0ceade9eb2cedfdc7f5755265fe4f9cd2a6eaf85 SHA-256: c034a65a1d75429c784a46cf81d130d5be7d6a302bf7115bfcec8349d9e4a0a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://krisoc.ru/uplcv?utm_term=theme+statement+examples+for+courage PDF link annotation
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/115a93ee2ba57fe17609181322599c3c/rofixute.pdfIn PDF document text
    • https://wrd13.com/force/file/28575349659.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/45o16ihpuch92sk75jjrcl9ca7/tewekokeruzijubadupuwe.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090230916936---81327677942.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/budorujumetezego.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/zutexu.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/1e59852a85722d539af30f879ed6ed31/xazozifaruku.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abf5959f08d---kubufigakig.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/djq5ueab5jeq0465vuvq7sfjo5/lilabikilefo.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/2190ed93577d750227a867459d7d2039/89762716969.pdfIn PDF document text
    • http://apcmagon.com/userfiles/9206098919.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7bbd96c559---69087900928.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/91779127002.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/79559160321.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/55168635884.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/73133070025.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c1dd24d11---fepazizezik.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/631821654a29f79e4361757b741f26a6/87747486947.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/5506886039.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/8497184734.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5c5672957---64267787221.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/leser.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac9fa92497---65906088692.pdfIn PDF document text
    • http://babamoleskine.com/files/file/ninumiwaxil.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/28893098394.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B5 11000 bytes
SHA-256: 6d9cf82caf22b7cfb7343b260ff0aa072483f0d64434fda230bc6eddb159ebc0
font_02_sfnt_off0001302a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302A 17112 bytes
SHA-256: 34129bf8dab1f58e461b77eb411cb52f05e7d23bf7c868f770d70da4a8eb40f2