Malicious PDF — malware analysis report

Static analysis result for SHA-256 622b864c6748ba05…

MALICIOUS

PDF

78.6 KB Created: 2021-09-16 16:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 556186bf92f88b3093bceea56389ec43 SHA-1: 3b5e2e27407fbc5f06ca3909880ee98d28d60906 SHA-256: 622b864c6748ba050b7bde66dddd09e81106c48d5114124a10541467c025228c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which appear to be compromised CMS upload directories. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination or to perform SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://ijmscr.com/ckfinder/userfiles/files/29896773063.pdf In PDF document text
    • http://akcjonariusz.com/UserFiles/file/67771031886.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/xaligejejowusipibu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/r96nhptj3372dobrrf7m94dfrg/felimisolomep.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/tuzapukexivozirovidowajet.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210914151411_2yccck.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/38171841.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/54629988214.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/96682479138.pdfIn PDF document text
    • https://andhimazhai.com/images/files/jigubufoseralopod.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/70163162845.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/64100272699.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/efdk9ea3hsvjogleu1kijmsj6l/6599914709.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/90349304959.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/wixinomum.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210909_013354.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ffde22a75---99214749336.pdfIn PDF document text
    • http://katachizu.com/img/news/files/fagazemiku.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff706bf8ca---lotapazodavolenedawerebab.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-10/20210910121107752864.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/73972b6f1222c383340c888e4963b43c/46481431542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=redmi+note+10+sunnyPDF 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_off0000ce75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE687 18012 bytes
SHA-256: 12b95858bcc9c9b8f4308d06357d3b8365572d6df1eaf118af138302006bec1c
font_02_sfnt_off00011502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11502 10532 bytes
SHA-256: 10d54f86bcd8c8e48e80a2253d6b15dd9c5bcdea9fffec5294ea6ce00ad88e31