Malicious PDF — malware analysis report

Static analysis result for SHA-256 987a1e9043e6d8c6…

MALICIOUS

PDF

102.1 KB Created: 2021-07-02 06:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0fee013e254a89c4dec84fa967e6929e SHA-1: e1b6879307e285b2f15a0dc6c9843f33fd2f7eed SHA-256: 987a1e9043e6d8c69912fb2ed83d84c0c7a5fed8e49a9ae5be31bbed89d785cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised websites and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic firings and extensive list of URLs confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://coretry.ru/uplcv?utm_term=rescission+letter+meaning PDF link annotation
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/0t6q2df4ok2e1urtqe5dl4dt96/lizotopekotu.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/1fd1f973971ae1148b644d70a6fae0de/dupokanupokezuded.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/xematuwebezokajosekeli.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a214c3165---setibuke.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/7a9d7ed3346f29d4058892fbe9fe1800/94229501680.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91455caf3---84995806341.pdfIn PDF document text
    • https://termocasasrl.com/file/nobedoguviluxusugalixupe.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/62567772453.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d2d0ec33b---68438889858.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/kerobi.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/otpcljiuslphva2v13qf6lk4v6/44860052969.pdfIn PDF document text
    • https://people11people.com/uploads/File/34632644830.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/38164135638.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aac0d67c63d---21926027866.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/22780530887.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c910c266ac---nirane.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/tiluguretijoxasefa.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986aaba53b1---86648003454.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/13026208690.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/52895381977.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/sasitilirogadonamaf.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ada3ca2967b---26518019096.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9d73c958b---xelevawomipajid.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/buwapolafavuk.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/jufuxavawekidevuraxowewob.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_off000130b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B0 10616 bytes
SHA-256: d025561ff3169d360d128476a898f06a69523665344d8981047eb64de31e0170
font_01_sfnt_off000148f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F5 16228 bytes
SHA-256: 4099a2815e0e508f178bf98fd2c1b6717b14a9a5ec58fd3a63a86711da98e443
font_02_sfnt_off00017300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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