Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1693c5fdc959ef9…

MALICIOUS

PDF

78.8 KB Created: 2021-08-28 03:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 217330b553282445a59f7f369bfd19bb SHA-1: 4d3ea6d203c85ea484d7e3b2ddc1cd91e247caa0 SHA-256: f1693c5fdc959ef9882aa1575c506f10bd15e5d3a71d64a191179fc37625fe3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites. The document body is heavily obfuscated, suggesting an attempt to hide malicious content or redirection logic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • 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.
  • 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://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/c89ebaadede0769f7b629a6d8334c677/dadopubujajevumen.pdf In PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/bb4877d37f3b978fac4c1fa731a9dd04/laxegibavu.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/pokesidi.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/70908265200.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/61416955566.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/298f18f18ad876f6ec3d959db9e05645/wezelarukowobogemuba.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/8f0557673ae549cd6b26f52cf4ff1036/52301778937.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/fae2eb2baaa1a2974dba97816fa85914/ropawak.pdfIn PDF document text
    • https://securitydm.net/slicice/file/71945190402.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070ddcd90477---mizitana.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c13acf62b---7409438661.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/megekova.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b98ce66fcfd---26666345461.pdfIn PDF document text
    • https://songhong.info/userfiles/file/wejoxolojadewakezigibix.pdfIn PDF document text
    • https://dintek.eu/uploads/file/zovetusiz.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/9326082529.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/61056766315.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e8b0b3c58e30df35496543d0d8dba264/53213424981.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e39192d915a---10853988790.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/14008512328.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/34548463118.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021070207494647.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609469099efe4---jufarabilovinijib.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d631e2a0359---54387134624.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/23399728344.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/vajirivogonuvar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=best+indian+authorsPDF 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_off0000d2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F0 10452 bytes
SHA-256: 2aebcf24eaa9ac96d2019b81167ff454b923fd8b7c4a1ad0a90cbbc887c14520
font_01_sfnt_off0000eaa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA0 16168 bytes
SHA-256: d5702fd289ef3b121e02fd59b71c6fe31ad4d0a5c457602689d79a0482fb4153
font_02_sfnt_off00011478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1