Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38ba7dbfb2c60d0…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 05:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 019c874b48cef2fd25ec30339cc79d9f SHA-1: 4d77dac7333c58ef2530dab54798d08df4f1fefd SHA-256: b38ba7dbfb2c60d03ba990095eb135409116d900f10f8ea6de79f0b0c8313fa2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ozhelalikram.de/resimler/files/nexetavibufawaloxewiwu.pdf
    • http://satyamtracparts.com/userfiles/file/najuvivuxasokon.pdf
    • http://urbanelect.com/userfiles/file/bikujo.pdf
    • http://benly-carson.com/product/files/dinafukitugevex.pdf
    • http://eros-arena.com/eros/userfiles/file/ziwanozivuzewuwew.pdf
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/velesa.pdf
    • https://pvesc.vn/uploaded/file/29003287512.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b8b7a1e69---vakokoluwemogefefokizug.pdf
    • https://congchung7.com/upload/file/nesezujarem.pdf
    • http://udmvdpo.ru/images/files/jumolasonanozesagoxiraj.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e7f3937053d181f01c30c652386ae101/74667988729.pdf
    • http://szyuangang.com/UserFiles/file///wiluponadelapig.pdf
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/dezema.pdf
    • http://www.physedu.in/newsite/userfiles/files/guxolidemomaxag.pdf
    • http://avandcie-automation.com/ckfinder/userfiles/files/gogudifikonox.pdf
    • http://racecross.com/upload/edito_fckeditor/file/3287346709.pdf
    • http://185.33.116.142/~bbyacht01/upload/files/pezava.pdf
    • http://nsfeed.com/_UploadFile/Images/file/novudijamowexadijale.pdf
    • http://livelyway.com/ckfinder/userfiles/files/mofovukakevitid.pdf
    • http://gostinica-domodedovo.ru/files/17121571936.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141db0573857---mazamezurubigivezo.pdf
    • https://daqing-jewelry.com/uploads/files/202109132357104024.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=drag+racing+money+and+rp+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5fc.bin
48c36c427d816c2f36fcc460ba84fde98e1b9bfd25e6d0d3cf7912aa938c0e50
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FC 10752 bytes
font_01_sfnt_off0000ee73.bin
33daca1843a2f7e8afa4f53352df72a1f482d79c436b5f236b64c9980990eb1f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 17532 bytes
font_02_sfnt_off00011ba6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA6 16792 bytes