Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6426645e00219b…

MALICIOUS

PDF

84.8 KB Created: 2021-07-04 18:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35b0223fd03850735e3af39ac23737a8 SHA-1: 4242e6f6a9d1b5912ddcbb22e1e9c3f18a0f0933 SHA-256: 5f6426645e00219ba17b12204bef8997898aabdacbdce021cc04077f7fe62d94
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the presence of embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf95fb9989---15036425361.pdf
    • http://cioccolatogallucci.it/userfiles/file/34239409449.pdf
    • https://drivetripper.com/userfiles2020/files/bewefupolekel.pdf
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/babexatipefedigiruduj.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075137349423---koruseje.pdf
    • http://envigest.cz/upload/file/14781145485.pdf
    • https://preciseenergygroup.com/media/81262906983.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/10f73cbcd91d7d80f9d18e428d7adb25/renadapifajago.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd71f03290---44589662467.pdf
    • http://auburn-properties.com/userfiles/files/71859063693.pdf
    • https://tasleemdubai.com/userfiles/files/86600869540.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092099bafcd4---56004655538.pdf
    • https://tangente-mag.com/img/file/1930550754.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da9d6a2097---99179265113.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948f2031e27---45190304041.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/egvde0c7ipg8pu8tgnfeegr34r/bemeg.pdf
    • https://cyberbirddog.com/userfiles/files/71572044219.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cdc5ba1b5---todufel.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/6e8041b16d6a0e801087123b6020aa46/zibiletun.pdf
    • https://autoteam.in/ckfinder/userfiles/files/7310135202.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/oq2lmgbl8s1mrr46oe9vlluvi8/noloraputet.pdf
    • http://sequirk.ie/userfiles/file/botamazepexuf.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/abm30apbjqlh15ltssq17vtdf4/53267402892.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089aab3f144f---rovudarutazuna.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/41762eb5c7519acee2e5a03120aacf77/kinojaludawavalute.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=treatment+for+irregular+wide+complex+tachycardia
    • https://doi.org/10.1002/9781119389613.ch41
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e71f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE71F 16792 bytes
font_01_sfnt_off0000ff36.bin
278fd097f3c3e9f2872e788ebf77410c29df19fdfd8c029e5d0ee2ff2f85ebc4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 11264 bytes
font_02_sfnt_off0001194f.bin
7c74167647d3c45d8103767ef53243e0dd5e09e78fd4c73c20440e00999b3fad
pdf-font-stream PDF embedded font (sfnt) at offset 0x1194F 16952 bytes