Malicious PDF — malware analysis report

Static analysis result for SHA-256 0855cf6b6f4e2828…

MALICIOUS

PDF

83.9 KB Created: 2021-06-29 05:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: baee660bdff9c7829dbe08d5e3a0c230 SHA-1: fb2c7109c3d14a308e96880bfa4eb2b4205a17c7 SHA-256: 0855cf6b6f4e28281e12ab42b3be25c945c1036026a11a2f75c2bb9d3132baf4
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body was unreadable, but the presence of numerous links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d5371e48---digef.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4d2284ddb---19153110232.pdf
    • https://ludifrance.fr/userfiles/file/vazivatisorawigonujomo.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/6097a02862605e0bd53d266a0a953741/68083035544.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c211e76dc---96422095096.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2675f00384---98496744937.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b449844028f---zitoma.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2eb6f51f62---23847076866.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98546ed8c---29882677896.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/02195ef83a6d9189db8964b7e8bd44cd/wezolisalev.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16212457365874.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608208e92e9b3---potefigiruveravo.pdf
    • http://stlnsk.ru/uploads/file/zavunafawifejozedani.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/d62bpb55bm7edu5hrjiinsq7ha/93410212455.pdf
    • http://auapp.ch/userfiles/files/sexane.pdf
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/31637423105.pdf
    • https://prestinireedcorp.com/userfiles/files/93934796980.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cb54782ac35---pisetobaxevosen.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/1efba8f08657629613c4a0b63deff25d/821832357.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16070064303546---24939548138.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094372c24b85---76278843639.pdf
    • https://aduanaldelvalle.com/userfiles/file/xerugosudajerememamowaj.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/1f425ad6d28b79ea61a70883051b466c/fipomojutexesoreriwazan.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5ea6cd888---96023353210.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=psc+2016+question+paper+and+answers
    • 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_off0000e39f.bin
12e6ec8de6fc1da3341aadf4463d178b16392be920d81587d93b4ab421d9582a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE39F 11256 bytes
font_01_sfnt_off0000fe1e.bin
18847917bc81786a42b48c5524eb9eb94a399fdc4bbfe16e1b63eade37dbf057
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1E 16884 bytes
font_02_sfnt_off00012a24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A24 16792 bytes