Malicious PDF — malware analysis report

Static analysis result for SHA-256 74143a9f919aae8a…

MALICIOUS

PDF

90.1 KB Created: 2021-07-22 17:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a7295aca38ba52034504600cd55d044e SHA-1: 96514ed683a9e55a088d255fa5e1c97bb9fc357e SHA-256: 74143a9f919aae8acf576f04432cbbbba5b27fe43234445739fea486c12a6956
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a high number of external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to host or distribute malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://saharun.org/uploads/ckfinder/userfiles/files/rufigamujuvapuru.pdf In PDF document text
    • http://phdpecs.hu/userfiles/files/84509534228.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d815ec287e---fidovopevutijemoxen.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210702154313_j9o8wb.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93c26a5059---duzasuboden.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/89632365424.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bd65611b0---duxifebejiteniwujikas.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ab59c05f4904a6bdc927c24bf29f3a91/86260284081.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/85956514419.pdfIn PDF document text
    • http://rilta.net/userfiles/files/xerokabazosubewe.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/18378102013.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cafd3c4c06b---59786068490.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a713bf18d47---vefuwanenirefenitutinivi.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/1469328628.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c7815125e---tuvivutusanevo.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/61c39cd7631c5b567dbd1ed261b9f009/mukifomijuvudidokanujepu.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/87474168158.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ff0a4e530---3227460698.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/662944a0c3c972f4874a794d102e569a/wikove.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be20a21746e---rezugujibuninodo.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d5e57830c---jelujifikal.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607687075c140---49882149313.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/56701181727.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c39eba82cfb---48468620883.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e757c41ffb---87316446005.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb4f1a1b64---18162198800.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b24b8bedcbe---sadapedixitudumenapotus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=compress+mp4+sizePDF 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_off0000fc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7E 17904 bytes
SHA-256: 4ad77f5bb0984497e5128e770cb5e456098db9c05c738fa29f802b58842e29f1
font_01_sfnt_off00012bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC1 10172 bytes
SHA-256: c7e86375b435c0012d1015ea2fa7faa1721b654ef9e77f6c71fd0a83bcdad31a
font_02_sfnt_off0001429b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1429B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1