Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6095aa922964ce…

MALICIOUS

PDF

86.5 KB Created: 2021-07-25 22:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62da688023f29441a1deaf764bbc0ff0 SHA-1: d5751738b15be48b6a3232f4cdfd8889cf2ccf33 SHA-256: bc6095aa922964ced4e5d2e7c10821eef4727c746e1e8904ae409cbfe7eda322
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4bdad3eb1---tabix.pdf
    • http://webinside.pl/userfiles/file/18725018301.pdf
    • https://etimes.mn/uploads/files/27463275462.pdf
    • https://monyetjoget.com/contents//files/zuravazivefeziworejefoful.pdf
    • http://bularz-auto.pl/images/userfiles/file/28718245395.pdf
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/linajux.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/e5c1f3febcb95682db8f0991e2ae6889/634153001.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbc5fab693---13507703133.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c25180bde---nefizap.pdf
    • https://aldapa.eus/files/galeria/files/telutoged.pdf
    • http://www.urbanwaterways.info/files/72038360593.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10bc5787c---suwixinokaniselezisuwa.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bddeeeb6ef1---fowinuraguzixukawujakuze.pdf
    • http://xn--e42bt3l.net/upfile/files/miboserigikagok.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/66183beb1c5aa8cbd885d8cea35db1be/20513098646.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775acad1de0---tofepejufafik.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098b4ed2964f---gerawepalata.pdf
    • http://mbcasc.net/imgs/file/68111427713.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864b9343455---gelomuva.pdf
    • https://anthonygillant.com/userfiles/file/forofalezigol.pdf
    • https://aitalk.vn/upload/files/21797769333.pdf
    • http://asbufestival.com/uploads/FCK_files/file/gaganibikagamabuwo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=red+stone+propane+heater+manual
    • 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_off0000ed01.bin
314dbee1777110f7f98b82595a741689bb581105584ba4d62b2122c41ba93e4d
pdf-font-stream PDF embedded font (sfnt) at offset 0xED01 17760 bytes
font_01_sfnt_off00011bd3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD3 16792 bytes
font_02_sfnt_off000133ea.bin
ca04bb66a2cd637ab1e5a1d682ce3d4d85f5263065b510c37985373ec0d0aad7
pdf-font-stream PDF embedded font (sfnt) at offset 0x133EA 10712 bytes