Malicious PDF — malware analysis report

Static analysis result for SHA-256 b306f9a94a1088ad…

MALICIOUS

PDF

91.3 KB Created: 2021-08-09 12:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18095e66e64d0e968550b4e2c47308e9 SHA-1: 6155c13dcf79b7635c7e2e1638cf63c11c34d105 SHA-256: b306f9a94a1088ad5797086839681b3307b6012f26e2c8749fc02b184f5281af
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ik81qgm4mnh1cpmp6b6iv8sq28/48869755633.pdf
    • https://vyrukrc.lt/userfiles/file/sivogawujekefo.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/37219354932.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/j3o6hr81p86bklap2sjp1hvjk4/witixutefanojawuriku.pdf
    • http://hilltoplancers1975.com/clients/13753/File/bobatak.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/7cdd999a78b1225a502b16d5cfa62034/ruxijejixomulunowip.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607297496eb01---marozifisa.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/h1gbv4h6jndg74sdatn1rv32eg/memifilek.pdf
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/22150054382.pdf
    • http://rakkhunnursinghome.com/user_img/files/63076021465.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/dsjge89uc2dvsn0khkt1h40uu8/rilulofejijole.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160878cc32162e---65142620990.pdf
    • https://spheresignal.com/app/webroot/userfiles/files/ditawutox.pdf
    • https://dm288.com/slicice/file/66639300066.pdf
    • https://hagabb.ro/ckfinder/userfiles/files/52348342683.pdf
    • https://uniqrelation.com/userfiles/file/67830619500.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/9d1c479575ebaeb115f803b0941078cd/63997331939.pdf
    • http://pnmanagementsolutions.in/uploads/dutiju.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c6fbbed55---87978118567.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862ab094463---9013981759.pdf
    • http://moyamoya.center/images/hand_uploaded/files/tekipaxojinizorijasid.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebec454b81---tunivuwajugir.pdf
    • http://www.hussco-steel.com/husscofiles/files/kikepaweresiwotuguxejisam.pdf
    • http://karmand24.ir/basefile/ehotel724ir/files/ribudufevedegamula.pdf
    • https://datatech-int.com/userfiles/file/lowujedakejerozi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+use+cornell+notes+template
    • 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_off00010003.bin
441d58860603533280462d6e543f7e8323dd0c25b685a459947e717b9156bca5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 10620 bytes
font_01_sfnt_off0001185a.bin
02ead1d9a8f491edd1ca90d179c14c394bf1e1d399e4ad92de27363ddf34a94c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1185A 17352 bytes
font_02_sfnt_off000145f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x145F4 16792 bytes