Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6cb8167b972077…

MALICIOUS

PDF

92.7 KB Created: 2021-07-26 12:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fde2bebd8a15607ed2c45d9394a9f0e SHA-1: 27c518ce7760c9c4c2ebb17c6a0440d370d8f150 SHA-256: bc6cb8167b972077edd9ce5f6576914f18aa944139ed48002a187387b3a99e4b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25f7938376---33850918205.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/723d15e580e7140d9997ec57f814fe9b/68721637529.pdf
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/fivoliweruxadukojarawim.pdf
    • https://jf-orvalho.pt/userfiles/file/17546818652.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca00c8dd06---woludewef.pdf
    • http://ruilong-ironwork.com/CKEdit/upload/files/vinuw.pdf
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/tuwedadowilujekumow.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/e6950d0708cee10004732511bbdcf2cc/gebijalodabob.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/3cd2b6f61efad669b271c9512d23ba36/71257103566.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a534f48a8f0---80179522475.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160abfa895178e---jakiwadakege.pdf
    • http://jandebruijn.com/uploadimages/files/98596240729.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/56456b72bab34b3ff3a665a65d783169/nimezubudikudokaf.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/8jrt4bfim2h33t2uktkshs9kcv/nojedipopobulogil.pdf
    • http://tramtronbetong.com/uploads/userfiles/file/ruwekomalawekewiwupof.pdf
    • http://mabifitness.it/userfiles/files/vonamorajoraf.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608641ed58f9a---sonoloniranere.pdf
    • https://mertlakustika.cz/images/pages/file/keraludapar.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/f56ca5mhtk9aq74pdvu7nreuo4/gelukewofufideravamegeju.pdf
    • http://gtlmarinefuel.com/userfiles/file/rodagebofunalanevanisad.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ce8742c48faea854d99c23b88f4a24b0/mabus.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=dell+venue+11+pro+5130+wifi+driver+windows+8.1
    • 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_off0001035e.bin
011dc8836cf1e08863acc58160cffffd78a333bd141300a30fa6787bcb823d13
pdf-font-stream PDF embedded font (sfnt) at offset 0x1035E 11240 bytes
font_01_sfnt_off00011de2.bin
85d392afadb38af35176a2862cfd3105e37e9251bc31e617eca8217c2daa9d30
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE2 17880 bytes
font_02_sfnt_off00014c7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C7B 16792 bytes