Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf68adfe54b65255…

MALICIOUS

PDF

82.2 KB Created: 2021-09-14 11:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9a3b0f9d9a128cd06bcede4e578e8004 SHA-1: be37c125a40546404102e55ceb3876e7318afc3c SHA-256: cf68adfe54b65255d5472d67ff79f9d4dfed31607c2f337e51732cea33e2b3cb
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number in a context such as billing or security, consistent with callback phishing or tech-support scams. While no scripts were explicitly extracted, the presence of multiple external links and the overall detection suggest it may exploit PDF vulnerabilities or redirect to malicious sites to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=how+to+record+internal+audio+in+android+9+without+root PDF link annotation
    • https://jasz-pap.hu/UserFiles/file/tilorufisofaban.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/75377750111.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/26431747183.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/gezupav.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/53677619468.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/42022285500.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/94551705503.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/a07b56f0adb45736e0f5a4e4e5c67d28/barep.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/77793106903.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c930588fdd---6235207374.pdfIn PDF document text
    • https://kvzriu.org/images/file/81920117986.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/zogedugoxunazoxo.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/21168677436.pdfIn PDF document text
    • http://evola.it/userfiles/files/60959689516.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/1045633103.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/78319077985.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/63834502274.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210906210317.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090822084251.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/20803679670.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/56227176782.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/28671885931.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210901165641_755676436.pdfIn PDF document text
    • http://frchem.cn/upload/files/sinuxozuwelalujilogixefeg.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390dfa15d0a---dubumebitisok.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_off0000dcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 17584 bytes
SHA-256: 9ae2b05abb9b7b88ce83b4c462757563c3d33e2bdc913b7f61e45e6b3628925c
font_01_sfnt_off00010a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001226a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226A 10644 bytes
SHA-256: 254d551ba35191cf4f65e67fa6e88a82dcb44961a4910ccd39ea0608a5735a10

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