Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3bd7f110a0103f…

MALICIOUS

PDF

83.5 KB Created: 2021-08-09 12:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f792fa432d798c686bcaf494d2ab7efa SHA-1: 9a81bcc886bd29a632ea0df2ca2a1d382b699756 SHA-256: 1b3bd7f110a0103f346a6401c4ff9f6a2b689627c0795ce61b645deb17b0315c
176 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting an attempt to distribute malicious content or redirect users. The ML classifier and ClamAV detection further support its malicious nature, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the presence of embedded URLs and the lure pattern strongly suggest an attempt to trick the user into initiating contact for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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.
  • 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 https://catamma.ru/uplcv?utm_term=wish+you+happy+birthday+images+in+telugu PDF link annotation
    • http://beiwendq.com/userfiles/file/32181771174.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608be53b84ad2---48132489357.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/45a55cca69eb547e74270a4d6c043b7a/61390766322.pdfIn PDF document text
    • http://santabruna.cl/upload/file/94854337721.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/wezikemi.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/zijepixosalifenek.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f161366b14---33915873124.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/xipopepasamibidufaxuxutub.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7635d08e42---8103646426.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/pepazanip.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/59551857676.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/77085838062.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7550235592---nidabolutekatilux.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/suxozesola.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e1986607f0a---84939700002.pdfIn PDF document text
    • http://halaljones.com/uploads/files/bozosumet.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/4c9vf1u9nv1q62cubeqbhjnrin/21715895227.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/nq8viqndevn5elpi4tbfvka3g7/82789609892.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b7480e855fa---ruximejafazupogimu.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da1bcd0cb09---xotegexexerorujimaledem.pdfIn PDF document text
    • https://wecareprogram.org/images/file/levajofikenisameguvuvawib.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/3e75d54da5787f2c73f66f492644ebf7/49586840164.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/68733286057.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/dufurujutofabeko.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d08818c2a3---87526809851.pdfIn PDF document text
    • http://svx.su/ffile/file/90686005587.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_off0000e1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F1 16660 bytes
SHA-256: befdab1f5f0f88336788a0f8604b29ddf9fa71750b2d436b5c206f9b721bb463
font_01_sfnt_off00010ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FE 11188 bytes
SHA-256: 1c8917dcc287c79d32eafe85eb62afa927a9bba20ef00688bced980c0be321a7

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