Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef13a22d90c53296…

MALICIOUS

PDF

73.4 KB Created: 2021-09-07 09:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 299070c8d7b16eab352d03dc4b2fa835 SHA-1: 16aee0cdf2b640d81c3a7531c5b42877edd45b7d SHA-256: ef13a22d90c5329668b88e513c4dbf944550cecfbc041d9f5b2e480f2eaadb78
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=clipsal+sparky+mate+manual PDF link annotation
    • http://grafiport.com/userfiles/file/renupegunusu.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/eac42d5d7f008734b3cf584138ffb6b1/ralonujegupage.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/luo06tmbn6j0kjo83nac1627i4/dexulu.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/mutiga.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/67751136990.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/35919371254.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070b05a5295e---gisizogudomibiloxome.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/xekedevivog.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/78671528241.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/gavavexovofemimigaxodeda.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fab583c58b---kavopafilufasipaneguted.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/cda5f620abc266efbf91a3d69177938b/81993972924.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7a54862v7etjm1lglg656brhe3/jubajeviwalaxo.pdfIn PDF document text
    • https://fallsplat.se/file/siwosaveb.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-2/20210902150208804674.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/mitovibi.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/22876140968.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/ledutekawimuwuzajenor.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/9065u9baia2aidtkl0ujqu7thd/sawasezugufamuliv.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/10983672879.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a903f66fa15---bomok.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/3pk69deio8jc98iht6f3gorncn/56014389603.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093943405e76---53821858234.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/29707412935.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/1d4c9eef471148f1673ad4cf201d957f/68043730706.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_off0000c184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC184 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD996 15268 bytes
SHA-256: 0ae93f62aff6240a6a7844593c577c3089ddd2b990b7e9b3ca82cc6f96e46db7
font_02_sfnt_off00010035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10035 10632 bytes
SHA-256: 161fa1cd9e28a1e4497c7b69f0e295e5841138aed83635a2d29c89d510c4bd19

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