Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fcd61c024a6330…

MALICIOUS

PDF

104.7 KB Created: 2021-08-05 21:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ea3b51d383c305489ebad49058993d7 SHA-1: fec5fca5047c1a56887729f05f0cf74e9f2b7d62 SHA-256: b3fcd61c024a6330409a50387414d1d4ff2aa5e447e1b625a1c2fd15bea69ea4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress upload directories. The primary attack pattern involves luring users to potentially malicious websites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9682

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/941ec8952bda6cdb648dce1c1a29c397/78974406434.pdf
    • http://darec.sk/files/files/veribazo.pdf
    • https://bobecoingatlan.com/uploads/editor/file/vupamosuxowuxapejig.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/vm7p2483h9okn6i68nmdg7cvkv/bokunepogokekotorefedobu.pdf
    • http://sendedianqi.com/upload_fck/file/2021-7-13/20210713205405874575.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/7a7d6a187e29654c71579fe07851d775/verola.pdf
    • http://dvg.asia/ckfinder/uploadfiles/files/zopefuweto.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/6706828e33fb71734944f5dae4a9ba89/43663613213.pdf
    • http://hasdeu.md/data/userfiles/files/38938263194.pdf
    • http://akcjonariusz.com/UserFiles/file/juraninemenunir.pdf
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/14494454569.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607a83dd40953---gurovifapimekalematug.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b1933687c---51175388436.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/542f16aebc0b77b6670250be78fb52d9/89682299062.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ffjk933b2gs598erubo1g66ql7/golutibujenaw.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0d6cdde843---sobomitemegedapotexiviw.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/6940798de19e8999039dbd377fe5835d/taxapixukej.pdf
    • http://macabrey-luthier.fr/data/Files/wazolowofiv.pdf
    • http://musicpark-live.de/userfiles/file/41767048684.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e24e2a3af---75923138258.pdf
    • https://nhaccugiare24h.com/uploads/userfiles/file/tesamugul.pdf
    • http://guojingmall.com/userfiles/file///nalixox.pdf
    • http://izdepskifamily.com/clients/1/1a/1adacdf247316bc4617b3617d965acc7/File/97599150672.pdf
    • http://taxicityplus.ru/userfiles/file/12259606233.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e5902de7a---xakasazema.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/4gscp33t4v7lbr3b14ruo0hejr/sanuzetuvataduko.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=naruto+vs+bleach+unblocked+at+school+66
    • 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_off00012300.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12300 16792 bytes
font_01_sfnt_off00013b12.bin
ed4b87dae83269081984e48e87b68bda3ed910bce1b87afe18af0657f26769e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B12 22064 bytes
font_02_sfnt_off00016ff8.bin
a7317e2837d7ae111d703d6222b3113bef701f2fddf43449dd85b5e575113563
pdf-font-stream PDF embedded font (sfnt) at offset 0x16FF8 10916 bytes
font_03_sfnt_off00018947.bin
8b9c37f35f6ba9e1150003acbedfe92084acdc782f4427e1a59c86f0ac26bc57
pdf-font-stream PDF embedded font (sfnt) at offset 0x18947 2660 bytes