Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be85b4acc40df7a…

MALICIOUS

PDF

90.3 KB Created: 2021-06-26 16:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a81f7c22b7576abd56977098ead815c SHA-1: 02234c2c68560ff9683512041ca467d94f1ff589 SHA-256: 5be85b4acc40df7abdaa0b521dc82e1a1065f0ac0f443065442982616984bdc8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs are likely used to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/bcdb95921cb49839153ad4e20b07a214/18668893327.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607183ce4def1---legaxuw.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/pcvhk90fjcb0f1mtck1j69ck51/narezekigaxomuf.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/6dfa901ab22721f5f4c6bf92048ecfe2/wumejamokiw.pdf
    • http://gmei.lt/ckfinder/userfiles/files/sepowivamaniwev.pdf
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/dfa8c2q6ih68io6272sbrp0c9q/69810933699.pdf
    • http://au-coeur-du-temps.com/userfiles/file/xuxijigavupufak.pdf
    • https://machinex-machines.com/UserFiles/File/89137255549.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/vj50umsrg454m12ldalpko9ht2/45174124234.pdf
    • http://vienhung.com/webroot/img/files/78267853589.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899fac2e15e---71721950714.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609840abe20f4---38901158361.pdf
    • http://yilip.net/userData/board/file/gekonovagefivuwulepi.pdf
    • https://jagominum.com/contents//files/25165043449.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819db0d741a---51616357030.pdf
    • https://mama-light.net/business_school/uploads/file/zisamukimub.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ueuo8p2prmp8haf6k6ks6l8vsl/47773803979.pdf
    • http://teechart.com/uploads/images/files/12144955779.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160742844272b9---levadiverogopivuxe.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adb256c7358---zumamupefosoriganafogov.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/602ae0417199f092ccecdc176c74cf64/38520688571.pdf
    • http://sushi-belovo.ru/files/piwamekidulamuze.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16202201816738.pdf
    • http://tanriovermensucat.com/uploads/genel/files/42879326141.pdf
    • https://keluargamimpi2.com/contents//files/vejisasotakufize.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160727f0e219e8---289557549.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=quality+maintenance+in+tpm
    • 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_off0000fe32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE32 16792 bytes
font_01_sfnt_off00011644.bin
be57028910ea07d1cb62cc40cb1283220a6be82c783d7f5048f9596b00332e26
pdf-font-stream PDF embedded font (sfnt) at offset 0x11644 17428 bytes
font_02_sfnt_off000143f8.bin
0ed03c344d04179471f39fd49424c5227e574c1151265c91d1d5c45f7d70d761
pdf-font-stream PDF embedded font (sfnt) at offset 0x143F8 10420 bytes