Malicious PDF — malware analysis report

Static analysis result for SHA-256 d918de45058f2f02…

MALICIOUS

PDF

118.4 KB Created: 2021-06-30 00:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6552171567ceb1b50695ef8a85a54edd SHA-1: a6f2d4fd13c7259e78daafec31bee808f7851316 SHA-256: d918de45058f2f02d9b43b7f5f03582db32826aaef752ed7be7e9abd7a99beb6
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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://charlesstreetvideo.com/userfiles/file/mixejosamomagisugunofib.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9061b7f5d6---sefanuluzupevubijavivon.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/1dde2d88db6095279e84f921bac35d2b/65363967039.pdf
    • http://fresh-j.info/images/uploadedimages/file/18447629957.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160da40026bd69---vanoxajoli.pdf
    • http://mya1fc.com/files/ckuploads/files/54274896945.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e5174c1e78697b18870a138c167dc648/67237143834.pdf
    • https://aokman-drive.com/d/files/guxeguw.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ada58c27d---69938658897.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/a9b9b45c152ea8ee6bbac55bd1e81dbc/54600922890.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/8226e4ac1d06bcd2c00b4bef89f27f3f/zenubir.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90fe30c0c1---ridawimejopor.pdf
    • http://seamcc.com/UserFiles/files/birevixufulamikafu.pdf
    • http://soldearenales.com/galeria/files/rarunurabu.pdf
    • http://balogmihaly.hu/UserFiles/file/bosusomefamixaruruwav.pdf
    • http://netmutum.com/userfiles/file/numasofogavo.pdf
    • https://myphi.biz/nbloom/fckuploads/file/54668215138.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a018c5f07a2---zirorebofagezejopugid.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/af159ecea328b3a7bbe357cf9c333c89/waxometuxilabe.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/42c51f0e5c21b51bb9e9760687b19b82/56650888172.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607429544aaf5---rotexekoreket.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea95e145f---pabanemonogizefujowugu.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c25550909---xuzegatajabanepukadit.pdf
    • http://hutbephottaihaiphong24h.com/upload/files/96375599651.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095c6e9efdb4---11639979692.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=good+night+with+moon
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001082b.bin
08ac22b93b7b74a93da8b7075b69cd0509eb62c383462690e8b777d20199f295		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1082B 17480 bytes
font_01_sfnt_off000135b2.bin
1a682eabfb7e6c7cb20cf16501c6a7743e3f8345d6862db9d27b2d53be53d17c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135B2 38324 bytes
font_02_sfnt_off00019d2b.bin
f2233cac2b00ec5ea0b2ea9555ae0366f1307e76393d08cac95b409d20095db5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19D2B 10212 bytes
font_03_sfnt_off0001b3ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3AD 16792 bytes

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