Malicious PDF — malware analysis report

Static analysis result for SHA-256 55341c20c052b5ea…

MALICIOUS

PDF

85.0 KB Created: 2021-07-09 17:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3b710272e1e4291cfe5a3e9dca18a41 SHA-1: 166a3b07d512c6a3a11b9fd74a6869bc4349e194 SHA-256: 55341c20c052b5eada34e83828978a5ec7bd2c0a65cefc5ae78f73f93ab6bbca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely intended to lure users to malicious content. No scripts were extracted, but the structure and URL patterns suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca05338b33---zekoledekubopuxijixutarew.pdf
    • http://zaun-produzent.de/userfiles/file/ruzotiwaxosopirijoz.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c53233b9228---56315038140.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba58d00a4d0---88295007535.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2d0327822---83207037092.pdf
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/musoximi.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609429a786393---savixapisixeduvem.pdf
    • http://jar-ted.pl/file/sojifukibo.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/609bd3ab8e61c64ac7ef3ba3d4e21373/42153595840.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/lercgrii6rqj6p3umkvnn6f163/58751298096.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/293241d890d7237481c24a5289ea07a3/88779180907.pdf
    • https://betenenergy.com/sites/default/files/file/sijamodaworalopuju.pdf
    • https://adikkeempat.com/contents//files/34169849804.pdf
    • http://morethancars.nl/uploads/edytor/file/31499497983.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e33ded92a4---40245643237.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d3840a6ee466fb58bc3933f4bdea39aa/71290155028.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/6a8731eb391588f6b41ea2d97ef421c5/pavalozekukixoz.pdf
    • http://gptools.net/userfiles/file/55830638768.pdf
    • http://terralindahigh1981.com/clients/866868/File/xoxuvadefijupiforul.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160937f29baabb---vemidalatixobokaziku.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080b7320c858---50529876827.pdf
    • https://reniuved.it/file/98405709595.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8b7488066---77435548090.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088889d5ea65---14999568398.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/9e84e9fbf62ff480ef8a0d3ee4a42da2/mifofezosovasafogin.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+use+web+browser+on+switch
    • 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_off0000eaf2.bin
ae08a6fbb7f16297ad21e54e7acae7692364e07adadce8637fcd8b21afa31e9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF2 10436 bytes
font_01_sfnt_off000102a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102A0 16792 bytes
font_02_sfnt_off00011ab2.bin
b9c82d829f87f84bd48b6ecf7413aa867267e345d97cc3ef2ff496da599c86db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB2 16744 bytes

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