Malicious PDF — malware analysis report

Static analysis result for SHA-256 48cb7a38d9b32fb7…

MALICIOUS

PDF

86.6 KB Created: 2021-07-25 15:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ed7aae6d110172625d408afcbe9bdd46 SHA-1: 9c7b15a5c9c24299730087c051da44bca4deea2f SHA-256: 48cb7a38d9b32fb798ffafcb13b1a1c965d8afc2d8584a0864be5ac1cb3875d3
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous links to other PDF files hosted on compromised websites, which is a common tactic for phishing or distributing further malware. The presence of multiple external URI heuristics and compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://verduciautodemolizioni.it/userfiles/file/89282535956.pdf In PDF document text
    • https://canevastoilestjean.com/upload/editor/file/jalobanufeneseses.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/83f763b0dbddbde006fbb35b80d6b69a/luraxizomu.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/f4efc9fb35c5da8c677f37db3ad13b64/958387319.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889aaac028e---51814425606.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/sewoza.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16080531aec35d---35919316270.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/cde34ef0f5c3aba34ab2c2af8c7adb7c/13532731529.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/a2d26f36e0a254b715cb396e744d620f/50309632437.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/d5252d7a4df40d52c408114991309ad1/masilatofaxifedijaxuz.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed3c2df3b0---84302834057.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/am84lbv0q0rjp1h810djih6mu3/88559987759.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/6cc67ab9cac95d3fbcc11a787476ef37/laderataxug.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/8tea0f2ipb61mnv98hhch4unnn/55279859145.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/4la2oqg0alborniuqs2gu1p4co/24143589576.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d93d9235022e7f0fe5454378833c2874/juweluj.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/81721927068.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b704c3ab66---kirobiwuwed.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1dbf990fe---kedovotapu.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/xumavoravemuxijozefufimi.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/temed.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/24034406151.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae647a5691e---75407107394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=gun+war+shooting+games+mod+apk+homePDF 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_off0000ec2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2A 11108 bytes
SHA-256: 31bd9756b504f9064794a15f7d50b6840c2af0f5a6dd3ed936fa22f68fa58b14
font_01_sfnt_off000105d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D0 17528 bytes
SHA-256: e46b5820f0fe905e9ed7d065959eca43d8e84c54cdff65829ab72931e5ea1436
font_02_sfnt_off0001341e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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