Malicious PDF — malware analysis report

Static analysis result for SHA-256 942b6156c6ba0df4…

MALICIOUS

PDF

75.2 KB Created: 2021-09-23 07:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 76f4d300ace39abc5a02b88b86abae03 SHA-1: 88529197ce45704a0532c57d3a1ca1accd39a673 SHA-256: 942b6156c6ba0df4f80787c8961993f266549cf7042f32135b97028a14e6818f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis point to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://laborke.ru/uplcv?utm_term=my+phone+keeps+on+restarting PDF link annotation
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/7148b12b89f1bdf50c183e80209624bd/30098246071.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/dibudumojixutakew.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/bobipiwexusixowek.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614612f0b46b9---sifununixesu.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/mapoditolife.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/tizefunulagim.pdfIn PDF document text
    • http://dges.in/userfiles/file/32911763623.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/86207919969.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/zopufigejuwupezisumeva.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/62904242982.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/dawubenurodi.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613213f038d3c---juvufaledirodiseruwifo.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/78719559287.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/wufajapenam.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-16/20210916220206669053.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/35450552749.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/bf78oss89qid75q596eu64ia2o/61650351000.pdfIn PDF document text
    • http://greenld.com/userfiles/78746174478.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/katazepibesuvolegov.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/ravudirog.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/fopitarojos.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/39876743535.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_off0000c2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AC 10684 bytes
SHA-256: 3ff019b835dde4df691ca503923643434411899fe62e844ba5c924dede737042
font_01_sfnt_off0000db2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2A 17208 bytes
SHA-256: 387f9a0652151620e19447683c816247fedc1537ca8e220de687bf8990db05e4
font_02_sfnt_off00010764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1