Malicious PDF — malware analysis report

Static analysis result for SHA-256 336feec8638e224a…

MALICIOUS

PDF

86.0 KB Created: 2021-07-05 04:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c0f633de1c288825d1c11c849f98740 SHA-1: 657d7ceff26d4e7c8809c4f17cb1b51842b637f5 SHA-256: 336feec8638e224aedb6fd65b4ed2624593ea66fe7750062056287390026716a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating it functions as a link farm. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://architects-desk.com/uploadsfile/50443616493.pdf
    • http://belgium-ex.com/images/blog//file/50435806963.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4f44e9498---76545793958.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160cd9f0ff36eb---89314437025.pdf
    • http://www.moyekolodin.com/files/14496981039.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/f74e32a7979975fafd8dabb7052381cf/zolixaziwazitorebujamafe.pdf
    • https://stopserv.ru/files/file/wumajijiwadaforidel.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826b0ec8425---42539500407.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c1104b3f18d---lupisitijinuxabawedavofaj.pdf
    • https://n-zvuk.ru/upload/file/mejamudasiporapawixipi.pdf
    • http://foodsafebox.com/ckfinder/userfiles/files/20021813874.pdf
    • https://alihuata.com/userfiles/file/52286709621.pdf
    • http://31kouqiang.com/userfiles/file/1624437239.pdf
    • https://oddluzanie.net/userfiles/file/muzipor.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/n2v7o5fmlaniq482conidasedc/56542118083.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/263955f0e4035adedd4b17c490fb6499/17624101951.pdf
    • https://ancoraeducacion.com/images/giletimu.pdf
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/14243770172.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/k9u4fq7i5vvhqk7fv5pfipfaa7/56573344369.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/aa65fe046f80d34e396dd14d95c88e09/jaragowike.pdf
    • http://profil-metall.de/content/uploads/file/19120176440.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703b4443cbe---lawazimezulijubu.pdf
    • http://dlt-nkp.com/fileupload//file/mijulozuvo.pdf
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/tozuradived.pdf
    • http://babamoleskine.com/files/file/vowujejofigiror.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210529_212B083AD5A419BE.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mixed+tenses+present+and+past+exercises
    • 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_off0000ed21.bin
3b8c29f4993a5f9728e49ecc7f8d9e7dfc8cec2a46bc86b49310751f8ff774ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 10436 bytes
font_01_sfnt_off000104ee.bin
5b91a227bf1847214bb10fac92feebfd186eae37db05879692a2f6058fc6fa02
pdf-font-stream PDF embedded font (sfnt) at offset 0x104EE 17216 bytes
font_02_sfnt_off0001324f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1324F 16792 bytes