Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bbf6a1f399df434…

MALICIOUS

PDF

86.2 KB Created: 2021-09-21 18:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 631b9746ce7765dbced841f5a1de6a9a SHA-1: 658049d6b386903c65ea47af65528d0f36236959 SHA-256: 8bbf6a1f399df434829c0eaf1797f2c808ae0b945ec2ffe91d84fba9c69a4b21
216 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The 'SE_CLICKFIX' heuristic indicates the document likely instructs the user to press Win+R or paste a command into a terminal, a common tactic to bypass macro restrictions. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext. The document also contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. No scripts were extracted, but the overall pattern suggests a phishing or social engineering attack aimed at tricking the user into executing a command or visiting a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://terralis.net/catalogue_dynamique/file/pabupuxokewanemotejevoko.pdf In PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e4f310fe4---45676059868.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/79756448610.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/bemamogowosul.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/kusinugovosorifupajav.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/lovotatifoliwe.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210911092449.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/808489606.pdfIn PDF document text
    • https://businesslife.com/content/files/rulimeluxovufixebapumobuw.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/xomiwiweve.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/b3d75aee8eba259159306956772caa54/memulolajafuxofokeb.pdfIn PDF document text
    • https://castel.ro/userfiles/file/99752513059.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210921_738E49D89A11EC98.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/32478422174.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/saludofaraxadodoronufer.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/83067371043.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614715cd53a67---namiziruluzuzutorifejed.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/bimadinedegaloziwezejani.pdfIn PDF document text
    • https://spacio.hk/attachment/file/24400418803.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/gagevesajodizogabamis.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/12070428090.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/wuzoridibutemuse.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/monoto.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/bowegeg.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/22783267077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=como+formatar+cartao+sd+no+androidPDF 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_off0000eabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABF 10492 bytes
SHA-256: 3ec1aafc2327d886d8059ed718e6fbeacbcbf8358bc628fe3d1f2844a05e091f
font_01_sfnt_off0001029a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029A 18732 bytes
SHA-256: 420956601a62fe81c34963785cb855c0ca0e213e19e0dd72b619060407716fca
font_02_sfnt_off00013365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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