Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c897fc783e9af2…

MALICIOUS

PDF

89.6 KB Created: 2021-08-14 16:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6604d006f0465f5128c69d82a1044b6d SHA-1: dd40a4c06c43dd7f0f182f253d7f9022e73d95b4 SHA-256: b1c897fc783e9af28b668a5b16f0518723916af7da8aee176cadc1c6b0cdd03b
204 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of an advance-fee scam. It contains numerous links to external websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a phishing or malware distribution lure. The document body, though heavily obfuscated, likely contains deceptive text related to prizes or deliveries to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=how+to+make+pixel+art+in+photoshop+cs3
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e02b1803c---pututapuwupasegaketemik.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502105133581542.pdf
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/sijuwiz.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ce41526cca8---pisexiratunune.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/be5fba1b930569b944b9a84dfeb30d09/pabavafejuwigasegebivotil.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608037a0ad773---3329036694.pdf
    • http://elitaliaweb.it/upload/file/86248110673.pdf
    • https://qwert5.com/psum/admin/userfiles/file/23055456582.pdf
    • http://primaneighbors.com/userimages/fulekelarabeja.pdf
    • http://rudolphalexander.com/uploads/files/lenenepugoparebisaligazog.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833bfb6f58b---71991868765.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9216e189c8---21144989262.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/d4bea1a5ad08b64995d7bdc65c353c7c/sivux.pdf
    • http://www.findvoters.com/userfiles/file/tiwutakiponolaluterifud.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/14cdc1ae3a4a294569565dc26475aabc/30189336856.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/ee0ee92266bf62506f796701a56e7bf3/42726719167.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3658dd52d9---63815108162.pdf
    • http://kppzp.pl/userfiles/file/takifuje.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/18842722038e6464aced710eeb9df7c7/13365677694.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/ac667b0dde3c1c7dbadc44cf13f47775/37694217841.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed08152ec6---69135938812.pdf
    • http://hani-bee.com/userfiles/files/zesopura.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/bfof3b05mcleauvur6gfef2sa0/32328072709.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/vaoacp3qolkq61bhq8aiachii6/kirovawoxe.pdf
    • 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_off0000f824.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF824 16792 bytes
font_01_sfnt_off00011036.bin
dec71169d4908c25a5c1446623000b09a8567fb4be854270129c74463c214413
pdf-font-stream PDF embedded font (sfnt) at offset 0x11036 17592 bytes
font_02_sfnt_off00013e2b.bin
260527c5122853beed08ebcc4e714147d21a2b62ab46fa0b6f62871f309c00e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2B 11084 bytes