Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a241f60ef962a1a…

MALICIOUS

PDF

95.3 KB Created: 2021-06-26 05:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01b997c682cfb45486edb6cb736bf9b7 SHA-1: 7fd56c1d1dfd024bce7ca3d33f3014ebfddc0754 SHA-256: 1a241f60ef962a1a9a94c98ab21df1407cfe253ccfa2264c4df214615b7dc8c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://garglob.ru/uplcv?utm_term=i+would+like+to+tender+my+resignation+letter
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/15culiigme2n4h68seamcbp4o3/54404514281.pdf
    • https://torgradio.ru/new/files/file/97149406688.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fb0536d25---tukapuwelanovubeberuxan.pdf
    • http://stroisvias.ru/userfiles/file/55821626693.pdf
    • http://a-kamen.com/userfiles/file/32461331316.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a367db064---xuzegujaponeluzajonibogix.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095effec1c84---8312365150.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8d0cc68a9---25051807872.pdf
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/87224632172.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48d2f2cbd4---72784119198.pdf
    • http://abovomedia.hu/_user/file/97666833781.pdf
    • http://luingpyrex.cz/foto/Image/file/91042197692.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b981fd9ebc---pamuwoviloz.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077d332918c2---lowuzavesosetonanasip.pdf
    • http://aven.su/userfiles/file/29936470143.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160910d5437908---jofemekagemotopunofawer.pdf
    • http://whewfamily.com/clients/12004/File/nusimudowa.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609657213a56b---lijakavevejaxitetita.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae6513f19---25465873490.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dddb2fae0---48969479566.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b58279ac1c5---58640488983.pdf
    • http://aimic.com/userfiles/file/supefekijerisogetobu.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebfe.bin
950ed369a355b56cb3302d86ac953cc233da07f8acf4e9eba9c1c8cb173bbd3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 12088 bytes
font_01_sfnt_off000111c7.bin
73e588c5006f9f0587d7bf7aceee39b63deb11d46fcfeb7edf5b286271d2871a
pdf-font-stream PDF embedded font (sfnt) at offset 0x111C7 16808 bytes
font_02_sfnt_off00013dad.bin
b20b2f40c93ad7aa205c033d52806d02b35bc5fbe2c49ca4ff71e2c29b5bb4b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAD 10932 bytes
font_03_sfnt_off000156de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x156DE 16792 bytes