Malicious PDF — malware analysis report

Static analysis result for SHA-256 71acda8127a90591…

MALICIOUS

PDF

71.7 KB Created: 2021-09-08 13:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71792cd0efe96ca36fa6ed949d7e858f SHA-1: f0702395974a5ee7f36cf6f8de4a9b82c1e392ac SHA-256: 71acda8127a905918792b33074cfe0c14b7921db0cd8e3bce719497d19265283
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Several heuristics identified the PDF as a link farm, with many URLs pointing to compromised CMS upload storage or disposable hosting. These links likely serve as a lure to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7bd174759b367fefb13b19cce0b21c65/37419156946.pdf In PDF document text
    • http://hodori247.com/uploads/files/64219940436.pdfIn PDF document text
    • http://szm.hu/userfiles/file/welajivevomajenim.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/siwulofufokavemexuvenopo.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/7927768861.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/a32aa5497de77375b49a20cd8a78d1e9/gezuwakadegatarozij.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/pijal.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/mutuwutori.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/7147539808.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210902113323_x6kc3a.pdfIn PDF document text
    • https://campermagazine.tv/public/file/rixigojejukixasep.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/72021659887.pdfIn PDF document text
    • https://bloc-immo.com/images/8335634955.pdfIn PDF document text
    • https://ibericadearmerias.com/file/kejurozusedodekedo.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/mutigovedasopuxitib.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/liwixava.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/42175671465.pdfIn PDF document text
    • https://iwistw.com/upload/files/85127648565.pdfIn PDF document text
    • http://tabletopad.com/images/file/pakuvipipi.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/727d1d60167a6d25172dc82fc6926bc6/kebibit.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/40411287568.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/49433516940.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd366a2e1c---98393273252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=2016+intense+tracer+275c+manualPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210903/16306068039757.pdfIn PDF document text
    • 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_off0000b427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB427 10920 bytes
SHA-256: ae66c3ba7e80697de841873ae6d05bd32d3423a3913fb7d570a2f022f399708b
font_01_sfnt_off0000cda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA1 17124 bytes
SHA-256: 0522345fb1f89f1aa544b9c0bc9ec74c70b96acb9a8e85836a0c439c690b679e
font_02_sfnt_off0000f976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1