Malicious PDF — malware analysis report

Static analysis result for SHA-256 a534ae3643ceea30…

MALICIOUS

PDF

95.9 KB Created: 2021-07-04 07:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cfbe9ce82e153fe8391a6589f12ed666 SHA-1: 2626cdbd0f59f6d3980aa5631a8e1c7966ed165e SHA-256: a534ae3643ceea301ea5d4de4bf001b5ced0fd6e033bd73250067f78fb269fac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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 https://synerhu.ru/uplcv?utm_term=guts+and+guile+meaning
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/avm2llmu05af0tafj0ad4ntven/wekosidolepugafuxo.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5699daedb---60071127252.pdf
    • http://allasclub.com/campannas/file/77264317642.pdf
    • https://mtmnetwork.net/uploadEditor/files/bujagunukipe.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/e43a6860ea85e08d89998edbf8cd023f/69970911028.pdf
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/26947650220.pdf
    • http://kencert.vn/uploads/image/files/memisatefivexaduvin.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/2056eai1jj07tn72u8rfuaea2h/4405182173.pdf
    • http://diclenakliyat.com/userfiles/file/jojiru.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/b068ad9035d78b8611cebc3316600702/wilezuzobodozo.pdf
    • http://azbuka-d.ru/ckfinder/userfiles/files/zakuxidokesolofujop.pdf
    • http://ahcxdq.com/uploads/file/291708328488.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/4f65dc1e721cc7e3068920835723c469/38612850889.pdf
    • http://szpk.hu/_user/file/zogavewikolud.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/befupusurum.pdf
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/wafomurekujuzor.pdf
    • http://shinies.ru/img/lib/file/75635288921.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/4t5b5lden0617m04h15sk1tsq3/59883002623.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096f3d0d18ff---56505446021.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d2ffd6e0c---33657516015.pdf
    • https://lawrenceyezersky.com/userfiles/file/nonipabanazojuzitasoro.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9d606c2f0056d8cdf21e6b9bf62eb86/24706349465.pdf
    • http://osteriadelcampanile.com/userfiles/files/43730075482.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/hc3tudr1p23cr08c09l0tp0or3/gikerolezabovarusugatuj.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e64c.bin
17507cf96eba059bf771e95664d6255a79d08d8a26702d469cdb4d01a14345de
pdf-font-stream PDF embedded font (sfnt) at offset 0xE64C 20692 bytes
font_01_sfnt_off000119b4.bin
120022e3f186dc8d6b7d00b1d34605844d3917f87ee078826fedbf68645f4026
pdf-font-stream PDF embedded font (sfnt) at offset 0x119B4 10512 bytes
font_02_sfnt_off00013164.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13164 16792 bytes
font_03_sfnt_off00014975.bin
9bedaac471f4f9452160e15620526b74b7153c7c03e169d93fd2888ade6a749e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14975 17588 bytes
font_04_sfnt_off00016495.bin
dd9e3e3caabdf127a2f046e8e552a5eea0203e441cbf497eb63e8e892678979d
pdf-font-stream PDF embedded font (sfnt) at offset 0x16495 2640 bytes