Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71032e175987bf6…

MALICIOUS

PDF

84.8 KB Created: 2021-07-02 03:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 686895948e4cb2d39a00e098bfd95c91 SHA-1: cc649ef640bbc6d633044bbe0554b17eaeca673a SHA-256: e71032e175987bf6056d6e90495c82c368e15d02a5cb82a9ea80bcd0c1ecddc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://irantruck.ir/data/file/medokakoguniji.pdf
    • https://glycocalyx.nl/userfiles/image/file/73587315115.pdf
    • http://bkbflooringusa.com/userfile/abbey/file/mezesuvanikinulot.pdf
    • http://teusz.pl/UserFiles/file/tifitanotutelowesif.pdf
    • https://angkoronetour.com/userfiles/file/rimakujefuxav.pdf
    • http://luatsubienhoa.com/upload/ck/files/2467385510.pdf
    • http://cortabellanews.com/userimages/5703101540.pdf
    • http://acutecardio.ru/sadm_files/74849719094.pdf
    • http://huiking.cn/uploads/file/200115596941.pdf
    • http://envigest.cz/upload/file/famatosisujovegoroxurab.pdf
    • http://nanumed.ro/uploads/files/fabubuxogetagad.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090d3928e570---21555517824.pdf
    • http://bertoniamministrazione.it/bertoni/public/file/fikore.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/49236171338f5e324eead5cd05e0f5cf/41533369477.pdf
    • http://feg.vn/uploads/files/gigofoxixoxuze.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606de7bbc6d71---25324660073.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7c0aaf529---93523763541.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607466699bf75---xabigesifarekezufafizen.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1075f31c2e---51192546335.pdf
    • http://mujuerp.com/uploads/ckeditor/files/20210527221256.pdf
    • http://celcg.pl/uploaded/file/lepufugekedivukugukubupa.pdf
    • http://grimastone.ru/files/30134643889.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=university+of+the+pacific+athletic+training
    • 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_off0000e6c4.bin
ecdae17eef2f830463d7f09855974a44ba5f5d5e24a6157cdaa234ca948c9293
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C4 17356 bytes
font_01_sfnt_off0001145b.bin
8cbacef80643f29bc067d2632c6417a2131c20d78bfa86b46ec26dd63c225a47
pdf-font-stream PDF embedded font (sfnt) at offset 0x1145B 10944 bytes
font_02_sfnt_off00012dc4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC4 16792 bytes