Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f3362d5080e07e…

MALICIOUS

PDF

99.4 KB Created: 2021-06-28 03:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43c979d1d4db8d5a7fe600cc554f0907 SHA-1: 2ff67f417e2289b353c06bd77b780e60de4c03b3 SHA-256: c7f3362d5080e07ef5484b907c652766bb7d4ad2dc540fc86c6bc82199bf02a6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to manipulate search engine results or direct users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://castel.ro/userfiles/file/89972494267.pdf
    • http://www.europesolidaire.eu/userfiles/files/94472100963.pdf
    • http://dolphinegypt.net/userfiles/file/54275255935.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cb83623ed04---92169894097.pdf
    • http://yuanyoujie.vip/userfiles/file/tewifipibuganu.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a640800dcb9---lesipito.pdf
    • http://clairerolo.com/userfiles/file/tozatakake.pdf
    • http://sns.hu/_user/file/zunorufajana.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8fcc5e3aff---18145631405.pdf
    • https://daaeportrett.no/upload/file/pulepiwavuze.pdf
    • http://rajskiewakacje.pl/userfiles/file/terarofenemipumuxidazifi.pdf
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/13989412186.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c79404c24b---25543925511.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc46221b27---rulobiripoze.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/pofivibatakowag.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160783bb894436---37682041018.pdf
    • http://beastyenergy.com/userfiles/file/30609189440.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb98c61480---kowavuli.pdf
    • http://jnnycc.org/userfiles/file/bewulukefujavukupotej.pdf
    • http://notariocprietoa.com/notaria/documentos/files/tejike.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cadb9dc45efa4132927eb7fe08867e35/54629260110.pdf
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/ptkj6ae2s8ak5fkq533ete1vfq/61748500974.pdf
    • http://asbufestival.com/uploads/FCK_files/file/35860802236.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c982985171151b0de1cd30cf5abbda3e/biretavufugujomogubigila.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/90t2jcnmjgvs8jgnscpvbt7lt7/golilivebumo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+solve+matrices+by+hand
    • 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_off00012179.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12179 16792 bytes
font_01_sfnt_off0001398b.bin
f47e9e40ef970e4abb6410bb76134a7d2e1e9878550c58abc90ff7b825be2800
pdf-font-stream PDF embedded font (sfnt) at offset 0x1398B 17064 bytes
font_02_sfnt_off00016692.bin
973673e95ac5d5700b75f3bd2ee3750395cbf1899786eee678aad86947f3ef6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x16692 11032 bytes