Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3e12ce5538d12a…

MALICIOUS

PDF

102.6 KB Created: 2021-08-04 18:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aab5942c959cb1d8b367f82517082bb4 SHA-1: 075d5d3582fc070f5c0fc0c5ffd7049b2c2dfa61 SHA-256: 3a3e12ce5538d12a4bdb6f159d4a5f777426984f07d8491976dbc33c2ce2fcb1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/mgra41cti0ltmogrjgf0no578e/zaloseguf.pdf In PDF document text
    • https://advik.net/userfiles/file/67574303839.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa56c1d0d3---94196238612.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab64464517---95319964057.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b8e024e0---97964515051.pdfIn PDF document text
    • https://ekransamara.ru/files/13974395790.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/82196793928.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/14069460616.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/13305992027.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/97283203082.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/bilixikoliwuveguwududeku.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/23116854443.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160873e68b482b---2848654365.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/majibadajewalexexo.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d691ee59dc---33109536360.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34f2f48519---zozisarer.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf5ec8e0c1---37815107870.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c50b3fbe98b---2417910272.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/73231812759.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/balonajotanidofavatu.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/3525756870.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/fudetodesanu.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082a81212d37---49274991355.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b47c12383e0---56140558398.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b2897233af7---veribavepebixak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+change+code+on+sentry+safe+x075PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B2 16076 bytes
SHA-256: 9dc74535a6692f4260f0355970fcc7bc2a5c5af40b851cc3ce6f07945a46146e
font_01_sfnt_off000127d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D1 18816 bytes
SHA-256: 5afb87d57d105c21944d794760c5705356c68087a701da5c463ff9a2752ddf75
font_02_sfnt_off00015787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15787 11216 bytes
SHA-256: e2fd3538c7feef956d538690fe40b6557eab5bb68c21d4688ae287fd22acc7fc
font_03_sfnt_off000171be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1