Malicious PDF — malware analysis report

Static analysis result for SHA-256 351656107791a09a…

MALICIOUS

PDF

86.1 KB Created: 2021-06-29 15:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1fe28a55097a6b3ef0cb1f7ac4b52f2 SHA-1: 90524ff8fc1c813a75f06d5e54bad1bf00300f3a SHA-256: 351656107791a09af2e438c3ab1d58550ec0e93eca13b4ff1a74d8c97f2af84d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's part of a larger malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hostingyuvasi.com/calisma2/files/uploads/91826064265.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bd44945a7a1---bumes.pdf
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/vasegufon.pdf
    • http://minerva-collection.net/files/files/77137865507.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/44bboj4dcdm63qtjskjnb52af3/tizexegenadakebegu.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/5a6395d68e32a4a78025fa73dac1b464/vamutigigodowalixib.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e020f2b2d4---jexedugegiwavusulobij.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62da3e48fe---5654875178.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad8dfc8a9a---sobupetezakol.pdf
    • http://usaoxin.com/userfiles/2021-6/file/78546538820.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c36b22843930d8259a4b56f7c35f9d9d/1148782068.pdf
    • https://mszukam.pl/dat//file/6105628358.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/fceea5f37be5d94f3535a71f70c0b6ff/tepulidufufilugugafiju.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d8a5d60cf350f381f4789e7cd729e091/fobanojodijimewam.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/7505e7329a08ecaa547777e37b86f80a/42769246028.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095be8de9639---99247940685.pdf
    • https://businessservicesuk.com/userfiles/file/vigudi.pdf
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/63502827736.pdf
    • http://igorodstore.ru/files/userfiles/files/puzaw.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16224420777125.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aafe7a016---40006235411.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/60994674675.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/7e06b88e7904cbb81409876c09b31a6d/59546712541.pdf
    • http://nirmalapublicschoolerumely.com/userfiles/file/lulumojiwevujowolizel.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/ea06b9eb184b13f45d5161125d002565/99864075416.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0671cdada---6003578315.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=great+ouse+ely
    • 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_off0000f00c.bin
5283970d9a9bf9bc59e120b87f41543d278a048c1aaffe80bcafa8e72779f7d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 10160 bytes
font_01_sfnt_off00010704.bin
d4e133ed7d21b79da0c9b455e95687dce725e0bdfd32e1da0a410a7407086bb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10704 16860 bytes
font_02_sfnt_off0001330a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1330A 16792 bytes