Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd336720e35aa63…

MALICIOUS

PDF

94.5 KB Created: 2021-07-09 00:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: aa16cffc9308ea5a22b5a3c3e1b5dff9 SHA-1: b42325fbcfee8403d5be33332bab606e3d2173b4 SHA-256: 3fd336720e35aa6371a65cc11a28b93657b6d79c98996bb310301bbce757498c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall detection profile indicate a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b1ef7540b---66450104366.pdf In PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/68922fccc5f856b4b24ced9c0c86e80e/89431510052.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/eb2739d7a019685319afa05cfdb877a9/9763722379.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160da0d7a8c064---lewugewo.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/tosaraborava.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/b3c3f44ad964838d9959aa92575f71fc/pafafaramut.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/f7164772ea1ad8622c68de45d697783c/86513361082.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/07/01/97947370.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/95031654451.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c9c4a19eb---rulikijezixizirotu.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/37736618006.pdfIn PDF document text
    • https://capecoralliving.com/media/file/33734589264.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb1c8f2484---68014037671.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ab39b007f64---jalafom.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/balemixu.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/rulena.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/zujasimabowubor.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/90843d00c99dfd47709e4a4652fa0fa9/73316821844.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/0dc0dv2usdg8roeenilvkvmur5/62151856986.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/98560f4601f154f7278dd7369135cfda/96821617014.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/6b0647129ece05ef73a0e219ec0ca267/lerowugesunada.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc56a911cd---lewibareseleto.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aabec1cdfc---23352265480.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/5f879cfddd744dfcc45b57587b3a5b14/97476027004.pdfIn PDF document text
    • http://artospace.com/pics/file/tojubetumowukogujokaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=signs+your+hydratedPDF 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_off00010ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA4 17404 bytes
SHA-256: 3414109391a0f877b1d310aeb0490b015242df7691556459aa298a48c287505e
font_01_sfnt_off00013c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15485 10772 bytes
SHA-256: f9fbbb8aab5291cdff79b5bd7ff176830c431ab4469d722e9de35c8837003d4e