Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86622fa371a1f1b…

MALICIOUS

PDF

108.3 KB Created: 2021-07-04 18:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8714fedfc2bc92f490babef7b1f5a1e0 SHA-1: c385f50910b1544b32bae87183eac3a15e3e5452 SHA-256: d86622fa371a1f1b101e6e88607061aa707d93b87ec8b3496cfdb3d51c00be47
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The embedded URLs point to various domains, many of which are associated with compromised CMS uploads, further supporting the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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 http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c16e49ca681---21110611418.pdf
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/dumamokide.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/44d96cc92f41bb52e73fb2aac07bd647/54578561535.pdf
    • https://digiconelectronics.com/media/94783885025.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873e51e2b21---roxiwopupopituge.pdf
    • http://www.pzkexie.com/up_files/file/selefokini.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608a695dc15ef---mukizulexeganenoguvajum.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/1af506ae4e4e51301cbc79c85d87a072/75463651621.pdf
    • http://pwr-tech.ru/userfiles/file/bokeluseregepuju.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/mopanubidin.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160738d88dbf34---80379565425.pdf
    • http://t-p-fortune.com/userfiles/file/33808104432.pdf
    • http://b-solutions.net/userfiles/file/3898840556.pdf
    • http://www.lugashotel.com/data/editorfile/98257754022.pdf
    • https://cuisinescartier.ca/upload/editor/file/rasulazi.pdf
    • http://techbis.pl/files/file/vutajalixazox.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/4518322e69979e59b87c8692465c1840/jonixofuvazibuvesot.pdf
    • http://moscow-vernisage.com/files/files/17578650115.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079a63e6002d---raxuzenilokeren.pdf
    • http://laulumaja.fi/ckfinder/userfiles/files/dovitapetavom.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875fd7bc244---23855301549.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb33b3a7ab1---35689466711.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6385cfed7593bdfda7bbca76eec35da8/jadegoleloduj.pdf
    • http://ypperfect.com/ckfinder/userfiles/files/biwugekitaluvoxosabi.pdf
    • https://cplastik.cz/data/cms/file/18307357171.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=meaning+of+narrated+in+english
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f26c.bin
6808348b4fc2c27884c4e4c6a43b7aa263fdcc0869d9034168c678cf418eaee9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF26C 27504 bytes
font_01_sfnt_off0001349c.bin
ae446d6f423fd600c48839546fd316ae0b06c7bce78fe46523472d9ac7a017a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1349C 10628 bytes
font_02_sfnt_off00014c97.bin
d597b0e8798946dd8c026a90f348987c6c365917c248c5f84574063b1f5c4111
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C97 5504 bytes
font_03_sfnt_off00015fd1.bin
384bbc2141c2fd19de7cdcba512205c8518bbadcfb5e66f8d76e1ac3d4ca9abe
pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD1 23060 bytes
font_04_sfnt_off000188fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x188FE 16792 bytes