Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3fdc4801e65e42…

MALICIOUS

PDF

89.6 KB Created: 2021-07-02 01:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff437b0bbf3e5797b247304e0bf60371 SHA-1: cf3ecc80081f485dfae32a11da51eb48bda26b4b SHA-256: aa3fdc4801e65e42a84493d836adb8a9c5573b767cc63399ffd65fbbaad543bc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to websites hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=drooling+in+2+year+old
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/219c55149dfc8d3da887093d37f8169d/wotarotedizunutisofiza.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/giridamexepunolavi.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/3441868e3c4359c530b0980666747464/disupuvomarure.pdf
    • https://tepihtrava.rs//files/51184397475.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7cs3lao465gud89gf8pl5qn8l4/rijetib.pdf
    • https://hgb.se/filer/file/28182870013.pdf
    • https://giovannicaputoboutique.com/file/134618622.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/tc2vg3la539mt2bs7q2ot8gi2a/69353227704.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/6aa4768fcab5011df6cbe138a8755553/42734046588.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/e9184f350ce38037dcf62fd0ed61b7b1/zuzozozirupu.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/c060a3b307dc2560ece63cdfc05ef188/19891672377.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b53c9e9ff1---92687475948.pdf
    • https://et-auditing.com/userfiles/files/fibiwororad.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/b9c8obj4ejen2n5rvjeesmi8e6/61762722272.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf11abc246---5136457948.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/qffulnrubc56ls1k6vku0iouat/gekewasaxasodegunaz.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/75v89vg9lt74pa7oqk2li2vc61/39499578034.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/e8c587f4fa7b8e78fd72156094ff55b9/kitamurorewetekipobonu.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/08a05346f108892513ac212715f27cd6/84396252284.pdf
    • http://karthikeyanjayaram.com/userfiles/file/94363474588.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f9470acf182ae65c5eac2c2346ff03f1/39603224375.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160783b04a10b2---xelujimutaseb.pdf
    • 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_off0000fd32.bin
5344eef50a3a0f5a74c6c643f8bbc58a7074368baa1550d72910397a9c88c83f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD32 10392 bytes
font_01_sfnt_off0001149d.bin
0584bb6154f18e09d471f1691ebd661bc6aa9d556317a9150817211c23fd7bc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1149D 17204 bytes
font_02_sfnt_off0001414a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1414A 16792 bytes