Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d789314a0125cb8…

MALICIOUS

PDF

85.9 KB Created: 2021-06-26 05:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 392632808c821b5a7e21377dbb121039 SHA-1: a2766879ed3fac2f7aee0975248a2a12f3d0c374 SHA-256: 3d789314a0125cb8db0a4bfcb0ea17258b0384f6382464df68177eee362538a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. Although no scripts were extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160766862275e9---12467727353.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/3fcee8b8a8f5d5796ffdf2040358cd73/wogitimiwuwurobuzapepak.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/t6tr931jkumlh8ok5d7sv41bdp/46810610138.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/f772a8f7ef6124aa4b6f58b053a4b763/kenetagaliro.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d674ba6293e---luzonapufojumoworabifob.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/vuufgs5okrbhqduagdsjdt58i4/jewiwurupusakavasuwawa.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fc4e31b89---68439499130.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/4cbb449375ae0b5c1d58c6c4c6aa014a/topitaminekejepetufura.pdf
    • http://panda-es.tokyo/yamituki-n/uploads/files/dudekivopetaviwafu.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/11095b9223aa4dcacf7680511693d35e/61396455375.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/adc38002fa12581193016b676282c6bc/ruluxitajolizakosame.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/a9457232c480b4f6d0730dbf0114ee83/timisokokilikixanejepason.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608936709a0d0---tipugevavenulupipaxoni.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7vrrrrsv0ag0h5anvh11hg5bm7/tagakidufekabox.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/cc2a9860d20d73d2a797df036831adb5/voxefosowaferapuvijofal.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/6ffb56c47153858bfd6d4234f3bf8aca/pumizevidelirisa.pdf
    • https://cissud.com/uploads/ck_editor/files/65511180748.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78d9b4b1de---voses.pdf
    • http://birzebbugastpetersfc.com/files/file/52430093561.pdf
    • https://tosto.cl/ckfinder/userfiles/files/jegevenaderikegoviji.pdf
    • http://miracleschoolministries.com/survey/userfiles/files/35732193748.pdf
    • https://www.indoorclub-informa.com/boletines/img/file/91028779626.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=troubleshooting+of+computer+questions+and+answers
    • 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_off0000ec74.bin
d08e01bd4683c2dc24cf5e00a68ce6bed773f962ee58555665a50c9290782e67
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC74 11500 bytes
font_01_sfnt_off000106d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106D7 16792 bytes
font_02_sfnt_off00011ee9.bin
142c466ff638a2c7e0a004a9fce636eac068adc4c8c7c8c3fdb8204778966511
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE9 16672 bytes