Malicious PDF — malware analysis report

Static analysis result for SHA-256 331bb7b3c0c4b2e5…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 08:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 50e545c0c4fb713bd96a1e4f2dec1bf7 SHA-1: 1d65850a71116408ea14c400463d22629c096a06 SHA-256: 331bb7b3c0c4b2e56b4755e671eea4a821f9d40e648f76ad7a7fd91953f63207
164 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and a link farm further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/dbf44d235e2d0669562cfd9e31d77dfb/zedib.pdf In PDF document text
    • http://a2hgghk.handylover.com/upload/files/34033775686.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/21513225129.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210920022348.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/wikiximeditirapibajodasef.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/bakimumikepinemobesokekum.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ce9fa6add---22808866001.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/seditajuxoruvulone.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/korobozodow.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/81998774450.pdfIn PDF document text
    • http://sayarbobinaj.com/file/25253432386.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/70878589208.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/38981982921.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/rudebakotinujitezovaj.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/90674203129.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eba571db2a---36474765020.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/bexiwegafoluze.pdfIn PDF document text
    • https://ptogel1.com/contents/files/30166677124.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/jowunusu.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80645903175.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/72419726327.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/2379056502.pdfIn PDF document text
    • https://pecintajp.com/contents/files/ganazojowozetipeko.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a4e4a3df---92709086651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=best+app+like+truecallerPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF165 10388 bytes
SHA-256: a6666290aa729da65e1ab22f337663739d7ef6ae80d9903f322fa675f54b1fda
font_02_sfnt_off00010919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10919 16832 bytes
SHA-256: fd5c019aa073b626e5e2a91c904aaab842b94e1bb4ce4e6d205f26d1eb953390

Open this report in the interactive analyzer, or submit your own file for analysis.